You’ve never heard of people responding to rule breaking with rule breaking of their own? Your assertion that it has no military advantage is flat out wrong, this attack has a military advantage. It brings the fight closer to Putin and requires them to divert forces. It also makes the Russian people more likely to revolt against the war.
I mean, that’s just happening in your head, we hate the Russian government and the subset of the Russian people who support it. Hating some rando for being Russian is still wrong.