I seriously can't tell if you're being sarcastic or not. In case you aren't,
@Mousse is most definitely not "at fault" for anything, the main reason being no accident occurred for anyone to be "at fault" for. Whether she was exiting her driveway going forwards or backwards (both are perfectly legal), anyone driving by on the street should not be stopping to let her out, because they have the right of way, and it creates confusion. Furthermore, were the cammer to "take them up" on their tacit offer to go first, but then the other driver continues forward and they collide, the person exiting their driveway would be at fault. "But it looked like they were letting me go" is not a legal excuse.
So you might prefer to back into your driveway, but that doesn't make others "wrong"/"at fault" for not doing so, nor does it really have anything to do with the situation Mousse described, as the other driver could've done the same thing had she been going forward. And of course the specific driveway layout and surrounding area will make a big difference in whether it makes more sense to pull in forwards or backwards (or it could be that neither way has an advantage).