Someone seriously questioned telling him to fuck off in front of his wife and kids? After what he did? Seriously??
Either the wife doesn’t know, and deserves to. Or she does know she’s with a violent rapist and is deserving of NO respect.
If hearing a bit of swearing is the worst thing that happens to that kid with parents like that, it’ll be a fucking miracle.
Yes, I did.
It's highly unlikely that his wife knows if there was no trial and no conviction. During which date do you think he announced, "darling, I raped my ex" or do you think he waited until the proposal? Or the wedding speeches? The birth of the child?
You really think that his wife would deserve to find out by having a completely stranger shout "fuck off you arsehole" at him in the street?Whilst she was with her NEW BABY? When she didn't have a clue what it was about? How exactly do you imagine she'd respond to that 
Parents like that ? What? So now people are experts on not only the friend but also the wife who, in all likelihood, knows absolutely nothing of any of this?
There are some bloody idiots posting on here at times.
OP Do NOT let people on here rile you up and act on that basis. Of course you are upset and angry about this. Anyone would be. But don't let strangers speculating about your oldest friend's motivations influence you. She may be being completely misrepresented by people on here who wouldn't know her if she danced past them down the street in a clown outfit.
Speak to her. People make mistakes; people misjudge situations; people don't always communicate clearly; people panic; people don't know what to do and don't want to cause a fuss; people are scared; people are fallible. If you speak to her and are not satisfied with the response then, of course, end the friendship. But unless you've had reason to doubt the friendship and were just looking for an excuse to end it, I would speak to her first.