Oh dear oh dear oh dear. A lot of arguing here.
Well, back to the topic. I have found the community in KF is pretty good. Of course there is the occasional beginner stopping at the trader door and blocking everyone because he opens the trader dialog in the doorway because he doesn't understand the others can't get past him, and the occasional person messing about with welder, but other than that, I haven't really had any problems. Or have I just been lucky?
I consider myself a teamplayer. I usually look which perks are playing and choose mine accordingly. I kind of like playing my medic these days, as it is often absent. My medic is lvl 5, so I would spawn with body armour, but if there is a player playing a demolitions or commando perk below lvl 5 in the game, I will spawn as demolitions (lvl 6) or commando (lvl6) and throw my starting weapon to him and switch back to medic when I can. Because I don't really care if I die in the first wave or not. But at least I have managed to kit another player out. I will spawn with a body armour and still can afford my MP7 anyway. If the player I kitted out throws me some coin so I can get a backup weapon it would be great, but not expected. I usually ask for some money if I need some, but only once.
And about welding people out by accident... It can happen, remember your player indicator does not show very far away, so people can forget about you being there. Personally, if I notice I have welded someone out I will do my best to get the door open before they get eaten because that will be one less teammate to save my sorry a**e when the specimens get too close for comfort.
I usually don't look at the kill counter because it is not the reason why I play the game. As a medic I usually check player statuses so I know if someone needs healing.
Arguing about strategy in community related thread is a bit irrelevant. Sadly it usually tends to escalate into an argument, which shows the darker side of the community as people argue about best tactic and call people using the "wrong" one idiots. This will only reveal their own arrogance and elitist attitude towards other players.