"If you're inspired to," and she truly doesn't have a preference - Integra didn't come here to manipulate him into doing her dirty work. (She would have said so up front, if that was the case.) "I just don't want a war of retribution going on right now."

'Right now' being due to all the new arrivals, and thus the kickup of activity in the political realm; if the under-the-radar vampire community starts being violent, she'll have to let Alucard off his chain. ('Have to'.) And that's always an... experience... for the community.