what they could do is create a profile summary for each player like dota 2 does and keep a track of their misconduct and punish accordingly... but then it requires a lot of effort from the devs and they probably got these suggestions already and are considering to fix this or add more content for players who wanna see something new... its tough being a game designer so just love the game and hope the devs keep up...
[unknown] that happens mostly i believe because those guys have good combat scores since they might have previously played fps games and are somewhat skilled at killing but don't have game sense, help them instead of fighting maybe it would work better that way