Yep, the old 'unclean hands' retort. [if you get an answer you don't like, attack on another front]
But if "to my present knowledge-NO" is the best you can do, then that's all I wanted, anyway. You don't think he was justified in his actions that evening. Therefore, he was unjustified. Glad we agree on that, at least.
Yes, what a relief that you finally understood a point I've been making since Sat morning.
"To our present knowledge" is always assumed, so the phrase isn't necessary, BTW.
Really? - If that's so, only a pedant would find it necessary to lecture on it, imo.