I'm not saying that I sympathize for Strom, but I feel his actions are justified. Screw the nobles of the Empire, they deserve every last bit of pain they receive.
Another evidence that this is a great manga, the antagonist have a motive that is relatable to the audience.
Yeah, he is a hypocrite for turning Kurtz into a kind of noble that he himself despised only for the sake of his experiment, but he's not the MC, he's the antagonist so all his actions are justified.
Still tho, is Ultimate Magic Research Society capable of fighting of an entire nation of demons?