Riot make it so we can FF when ever and stop these trolls

Ok here is my example of why we should be able to FF when ever, so I like basketball ball right my favorite sport let's say there is 6 people and we want to play a game but that 1 person doesn't want to be defense so he says he won't try are you getting where I am going? Well all us 5 people that want to play just needs to find another person and just leave BUT in league you can't do that, The guy that's wants mid lane is just going to afk or fed or do some thing that I troll. that's why this game is so toxic and why we should FF so we don't have to waste 20 minutes of this one guy trolling just too FF and make a new game yea right make it so we can FF when ever make it alot easier with these trolls riot. By the way this is so true I bet every one will under stand what I am saying.