Well, you are the one to make absolutely bogus claims, so it would be your turn to cite some sources. 
Give me one single account of either a fragmentation grenade or a concussion grenade taking down a building. I'm talking about real buildings here, not the plywood sheds Americans call a house, and even those would easily withstand 3 frag grenades inside set off at the same time with an intact roof and closed windows containing the explosive force.
Also, 60g of explosives =/= 60g of explosives. A fragmentation grenade is a non directional explosive device, so that means that almost it's entire explosive power goes into "hot air", following the natural way of the least resistance. A directional charge on the other hand is the exact opposite, with most of it's energy being directed into one certain area or point.
While 15kg of explosives directed to vital positions with pre-drilled and weakened sections and directional charges set to take down steel beams (filled with water to increase the explosive force) are enough to take down a large structure placing the same 15kg of explosives into a room in that same building probably won't even scratch it's structural integrity.
Just stop pulling stuff out of your behind and grant us some insight into your all knowing mind. Unless you do that, stop making unsupported claims.
Also:
While defensive grenades such as the F1 or the Mills Bomb do indeed have a lethal radius equal or greater than the effective range it can be thrown it doesn't mean that they are 100% lethal up to that range. A modern fragmentation grenade has a lethal range of about 10-15 yards with the capability to wound up to 30 yards. There is no way that if a soldier throws a fragmentation grenade he would kill or even wound an entire squad behind him. If they are out in the open, maybe slightly wound one or two, but the chances for that are pretty damn small.
Also your talk about "walls or rooms intensifying the force of grenades" is bogus. It's true that the concussion effect will be slightly enhanced, but this is only really relevant for offensive concussion grenades such as the Stiehlandgranate M24 of M43 without any fragmentation additives such as the Splitterring as this is what they have been designed for. Defensive grenades such as the Russian F1 fragmentation grenade nearly entirely rely upon fragmentation, on which a closed room or a wall nearby has exactly zero effect compared to it's fragmentation lethality.
Now if I may introduce your highness to the basics of grenades:
There are two main categories, Offensive grenades which often rely upon concussion and generally have a throwing range greater than it's effective lethality range and which have been designed to be used against fortifications such as trenches or bunkers, and Defensive grenades, which nearly entirely rely upon fragmentation and are most effective when used from cover against targets in the open.
Give me one single account of either a fragmentation grenade or a concussion grenade taking down a building. I'm talking about real buildings here, not the plywood sheds Americans call a house, and even those would easily withstand 3 frag grenades inside set off at the same time with an intact roof and closed windows containing the explosive force.
Also, 60g of explosives =/= 60g of explosives. A fragmentation grenade is a non directional explosive device, so that means that almost it's entire explosive power goes into "hot air", following the natural way of the least resistance. A directional charge on the other hand is the exact opposite, with most of it's energy being directed into one certain area or point.
While 15kg of explosives directed to vital positions with pre-drilled and weakened sections and directional charges set to take down steel beams (filled with water to increase the explosive force) are enough to take down a large structure placing the same 15kg of explosives into a room in that same building probably won't even scratch it's structural integrity.
Just stop pulling stuff out of your behind and grant us some insight into your all knowing mind. Unless you do that, stop making unsupported claims.
Also:
Not really.that could easily kill a friendly squad behind the man throwing the grenade
While defensive grenades such as the F1 or the Mills Bomb do indeed have a lethal radius equal or greater than the effective range it can be thrown it doesn't mean that they are 100% lethal up to that range. A modern fragmentation grenade has a lethal range of about 10-15 yards with the capability to wound up to 30 yards. There is no way that if a soldier throws a fragmentation grenade he would kill or even wound an entire squad behind him. If they are out in the open, maybe slightly wound one or two, but the chances for that are pretty damn small.
Also your talk about "walls or rooms intensifying the force of grenades" is bogus. It's true that the concussion effect will be slightly enhanced, but this is only really relevant for offensive concussion grenades such as the Stiehlandgranate M24 of M43 without any fragmentation additives such as the Splitterring as this is what they have been designed for. Defensive grenades such as the Russian F1 fragmentation grenade nearly entirely rely upon fragmentation, on which a closed room or a wall nearby has exactly zero effect compared to it's fragmentation lethality.
Now if I may introduce your highness to the basics of grenades:
There are two main categories, Offensive grenades which often rely upon concussion and generally have a throwing range greater than it's effective lethality range and which have been designed to be used against fortifications such as trenches or bunkers, and Defensive grenades, which nearly entirely rely upon fragmentation and are most effective when used from cover against targets in the open.
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