I 100% agree with you that the system if broken.
I just got a 14 day ban for being toxic. Here is my chat log from the game that got me banned.
Duprizzle: trundle u will get a better clear if you start blue
Duprizzle: you have no aoe
Duprizzle: well you're playing super aggro
Duprizzle: it'd be nice if you'd stop getting caught.
Duprizzle: don't bm me when you're playing shitty
Duprizzle: report lux toxic and int
Duprizzle: muted.
Duprizzle: you got pulled
Duprizzle: nmf
Duprizzle: my team somehow thinks I can stop them from getting hooked X)
Duprizzle: and now lux is mad so she's trolling too x)
Duprizzle: lux afk
Duprizzle: gj
Duprizzle: lux afk in fountain
Duprizzle: why surrender
Duprizzle: reported all team
Like really? I had even muted the team to keep myself from flamming them during this game.