Why 80% of my games my team has to be troll?

I'm an ok player not perfect and not that bad...i went from iron to bronze recently and now i'm getting even more trolls in my team.. Why those really bad players are allowed to play ranked games? Maybe there is a purpose? Check my match history and please avoid comments about builds ,farm or wards cause when you are in a super trolling team that stuff doesn't even matter,
Report as:
Offensive Spam Harassment Incorrect Board