You were most certainly starting down that road by indicating that this was a regular behavior for these two. If it was a regular behavior then other officers must have known about it and been unwilling to intervene. I've been on INGO for awhile now, not much new to the arguments here.
I'm sure you wouldn't shed a tear for these officers if someone were to retaliate had they been treated wrongfully. The unfortunate thing is that if that were to happen and the officers (or former officers) were to dish out a healthy ass whooping for the effort you'll be quick to find fault again.
The "victim" in this case admitted he wouldn't have behaved the way he did had he not been intoxicated. Knowing one of the officers personally I can say the same applies for him. So we have mistakes on both sides of it. People can say whatever they want about current bar etiquette but if someone takes a personal possession of mine out of my hand and throws it while I'm intoxicated, chances are there will be more than a friendly discussion to follow. One of many reasons I don't go to bars and drink more than one and that is a rare occurrence.
Escorting a guy outside while you're intoxicated off duty is one thing. Beating a guy senseless because you have a 2 on 1 advantage is a completely different matter altogether. But the best lesson is don't badge someone simply because you want to intimidate them when you're not in uniform. Granted, throwing it wasn't a brilliant move, but I doubt the 2 fine cops would have taken it any more kindly being told to GFY like the guy should have and left it at that. I'm betting the result would have been the same.