I'm sorry all this is happening again. with regards to your grand-daughters: he isn't leaving, he is verbally abusing you, he is drinking and acting out. they deserve a home that feels safe especially after everything that has happened to them. Calling the police, him being arrested and you regaining that peace in their home seems the best and quickest of two scenarios that may upset them.
I know you say he has uncanny luck with the legal system, and I can beleive it; people give addicts millions of chances to prove themselves, that includes those in the legal system. In order for the legal system to stop giving him chances to come to his sense on his own, the people there have to see him throwing those chances back in their faces as often as you do. They can't know if this isn't brought to their attention. That seems to be the only way to get those folks on the same page as you, regarding ensuring your wellbeing.