I'm gonna put the most positive spin on this possible just to get to my point at the bottom:
So it sounds like McDonald rents an apartment for his ex-fiance and their kid, and they were all there when him and the ex got in a fight. He wanted to take the kid with him, and she locked herself with the kid in the bedroom. In the most generous reading he broke the door down but left without ever actually actually making any physical contact with either of them.
Even in this best case scenario he's breaking a restraining order by being there, which might kinda suck for him, given that it sounds like they were all already there and he was breaking it with her consent.
SOOOOOOOOO, even if we spin this as far as we humanely can in Ray McDonald's favor, he clearly 1) has very serious anger issues he needs to deal with and 2) this is clearly a remarkably unhealthy relationship.
THE POINT: If the NFL even remotely gave a rat about curbing domestic violence and not just protecting themselves from the PR hit of it they would have ALREADY had his stupid @ss in counseling as a precondition of his return. The Bears could have done this too as a precondition of his signing, and they did either.
I'm not saying that had he been in counseling this definitively wouldn't have happened, but that the NFL is completely disinterested in actually trying to help any of these people help themselves and only cares about the PR bump from punishment speaks volumes, IMO.
Ray McDonald has major issues, and he will regardless of if he plays football or not. No matter what they say, by their actions it's clear the NFL, the NFLPA, the 49ers, and the Bears don't actually care.