First of all - how you define an arsehole is probably not the same from a managers Point of view as it is from yours and mine. There isn't a player or fan in the world not supporting Real who wouldnt consider Ramos an asshole - but from Real's point of view he is a Saint.
If OGS defines an arsehole as a player who thinks about himself first and behaves like a total moron towards his teammates - I can promise you there are not many in successful teams. Even Ferguson got rid of a bunch of players he considered toxic to the Environment:
Stam, Becks, Whiteside, McGrath, RvN, Ince to name some
This is the problem when people only look at thing only as black and white the way Ole saying thing. Now all the players who fell out of favor and left are arseholes/toxic to the environment.
In Stam case, it's extremely harsh to say he was the problem. If anything what Stam did wrong was similar/the same thing Ole did in this interview: opening up too much to the public about what normally but unspeakably ugly aspect of football operation!
"You either die a hero, or you live long enough to see yourself become the villain"
Players may grow to be a hinderance, as the team evolves, and it's better for all parties to part way. Breaking up can be ugly, but not the former players just turned into arseholes overnight. What about when they contributed? For Ince, the issue was not new. He contributed and his usefulness outshined his bad behavior, which made him tolerable for all those years. Why did he last for all those years, if he's just only on his bad side? And as you said, Ince was only one of those who got "kicked out". So this kind of arsehole talk is just relativity to the contribution of individuals, and team success. Ole is not wrong in what he's getting at, but the way he did it is digging his own grave. He has so much to prove that he has built/ will build a team that will be successful. Or it ended up like Wenger's Arsenal where keys players rather jumping ship to be looked at as arseholes traitors, to win things elsewhere. Ashley Cole, Kolo Toure, Adebayor, Clichy, Cesc, RVP... all being scapegoated.
Even Messi had been in different discussion considered a hinderance. Abidal incident just brought the subject to mainstream, not just a mere conspiracy. So yeah, the point is anyone can end up a bad influence. Is it all just black or white? Should it be opened up to public, or just it's better to leave the not so well kept secret as it is.