No wrong, the reason they quit is because they get the same champion over and over and over again. the "All Random" option is broken and flawed. It will give you the same champion 3 times + in a row and yes even though that "in reality" be random, but they need to have it where it will not make you be the same champion more then once. This is the reason I end up leaving arams, and yes I'm admitting to it. Because I dont want to play as kayle for the 4th match in a row. Perhaps 2 times in enough MAX.
And honestly I encourage people to dodge if they have been givin a champ that they've played in the previous aram match. I ENCOURAGE that because the system is flawed.
As for the people that just quit because they dont like x champion, well thats another story.