There are some issues here that need to be separated. Just because you are a mother, doesn’t mean that you should stop having fun in any way, shape or form. Somethings you shouldn’t do, but really, parents sometimes need some time off (not saying this is the case but I’m babysitting next week so that a good friend couple my girlfriends can have some time to themselves).
As long as the parents aren’t endangering the children in the process, its fair game. Secondly, because someone likes to party and get drunk, it does not mean that she is free to rape. That she is putting herself in an less than optimal position by getting drunk enough to forget everything, this is her choice. If you want to get plastered, you should be able to do it safely. What you do to yourself is none of my business unless it endangers other people. Just because somebody is fucked it is not enough reason to go rape/steal/beat up/ take advantage to them or cause serious physical and emotional harm.
The real problem here is how easy it is to convict an innocent man of rape and how much damage this does for the people who have been raped. The bigger issue here is that somebody can blatantly lie and go almost unpunished by the law. Situations like this undermine our legal system; something like this ain’t something that we should be slapping wrists for.