|Image Credit: Lee Colagiacomo|
Donating to the orphanage is "investing in potential future minions". He helps defeat the goblins who are harassing the townsfolk because nobody gets to harass the townsfolk but him, plus the townsfolk exist to serve him. He declares surrendered foes his "minions" and just lets them go (it helps that the only foes to surrender so far have, with maybe one exception, been the most hapless of mooks).
He always coöperates with the rest of the party as much as possible, often giving up his share of the loot (usually when it involves coppers or silvers, so he doesn't have to carry it) and using most of his wealth to craft potions and wands for the party's use, on the grounds that such trivial matters as wealth are beneath him and that making his "minions" more effective is a more efficient use of his resources.
Killing, too, is beneath Dr. Blelyj: he's never defeated an enemy himself, has only cast maybe two damaging spells in his life, doesn't even carry a weapon, and he usually only debuffs the foes and buffs his "minions".
If there's anything morally questionable -- or just funny -- that I can't think of a specific eeeeeevil reason why he would oppose, I fall back on the catchphrase, "_____ is beneath me." A not remotely exhaustive list of a few other things that Dr. Blelyj has declared to be beneath him: jaywalking, theft, racism (though he did announce himself to be "racist against cops"), alcohol, prostitutes (but not in the literal sense), piracy, and deities.