I don't have any commentary, just... interesting. Maybe ideologically motivated, but Japan's left hasn't done anything like this in a while afaik.
If there's some context I'm missing here please let me know, I've been out of the loop on Japanese politics for a while now.
The shooter has been ID'd (Buy the media so who fucking knows) as a former Japan Maritime Self Defense force guy. I haven't seen any details beyond that and his name. so who knows what the motive is.