Robert Downey Jr. doesn't only know about redemption, the guy is redemption personified.
Don't ever forget, this was a guy who at one point couldn't get cast in a Hollywood movie due to his copious drinking/drugging/getting arrested/waking up in the wrong house.
So it's understandable that he has sympathy for current Hollywood pariah Mel Gibson, whose own drinking/driving/anti-semite-ing ways have made him essentially unhireable.
Still, it was pretty surprising how far Downey went in a new interview with Deadline. When he asked if he'd make Iron Man 4 (something he's said he has no plans for) if Gibson directed, he said yes.
DEADLINE: Marvel badly wants Iron Man 4 and you’ve said you aren’t doing it. How about the idea you’ll do that movie if Mel directs it?
DEADLINE: Is that our headline?
DOWNEY: Why not? That movie would be bananas.
Of course, it was probably just an offhand comment he made because of how unlikely that is to actually happen, but is it really all that far-fetched? A lot of time has gone by, and Hollywood might finally be ready to give Gibson, who Downey says has "really changed" another chance.
Also, money talks. Iron Man 3 grossed $1.2 billion. For that type of dough, Marvel would probably let a pack of rabid dingos direct if it would get Downey back in the suit.