Player Behavior Problems.
I'm not the First one to call out this problem, but a lot of the posts/discussions are just people complaining about how they should be unbanned when they clearly did something wrong.
now sometimes this does help and a false ban is lifted, but this happens 0.0000001% of times.
now no one can stop people from complaining about Bans, people get pissed its natural.
I just wish players would consider contacting Riot employees or just suck up the ban (granted, Riot employees do have more bans to give out and can't listen to you complain, but complaining about something on boards or reddit only gets you more hate, I rarely see people support unbans from people that are toxic, flamers, etc.
that concludes my opinion.