It's just typical. in 95+% of games I get trolls and inters who go out of their way to make the game miserable. Even looking at their match history, you can see they have a history of this, with no punishment or reform. And yet Riot choose to let them play. Why not permaban inters? Would solve so many issues.
Just have a 0 tolerance for inting. Someone ints once = permaban. Or, better yet... an IP ban. If they have family who play, then tough luck. Now they will have mad relatives. Players will quickly adjust.
But then, if these inters are banned, who will buy RP? I think I can see the problem here... Riot clearly cares more about money than the playerbase, no matter what they "claim" in their dev diaries.