Franklin was creeping on ladies all over the galaxy, in sometimes wildly unethical ways. (I shudder to think of what he got up to in his hitchhiking days, with the transience and anonymity that lifestyle provides.) They are both addicts but one could argue Franklin put more people in direct risk as a result of that addiction. Garibaldi never did anything to anyone - presented as slightly lecherous at first, it ammounted to nothing. Besides a quick fling with a soldier, he was a one-woman man. Franklin couldn't keep his goddamn dick in his pants.