I was on your server earlier actually. I got kicked 3 times and banned once (you did un-admin one guy, good job)
Your admins are terrible. The rules aren't followed by even your admins. If the rule is "builders must have lights on, no killing builders", nobody should get kicked or punished for killing someone with no light.
The admins themselves admitted to being angry and mistaken. The problem isn't with the players, it's with your choice of admins.
And warn players instead of just kicking/banning them.