This system is sooo unfair it unbelievable

why is it that people who do stupid shit get to keep playing this game my last game someone literally fucking said "I dont want you guys to win anymore" and just stopped teamfighting and sat in fountain multiple times and itd be different if we had no chance but we were about to fucking win and he just gives up and of course this isnt the first time this has happened ive come so close to climbing so many times and someone just says ha fuck you and ruins my game and you guys never ban them clearly because ive been in games with people days prior that ive reported and its just so so so unfair like honestly i know youre gonna read this and say i dont give 2 fucks but you should this game actually used to be fun and now its just beyond stressful