Psychology
Do someone a favor for you, and they'll end up liking you more
In 1736, Benjamin Franklin won over a hostile rival legislator by asking to borrow a rare book, not by doing him a favor. Having gone out of their way to help someone they were inclined to dislike, people unconsciously conclude they must actually like that person, easing the inconsistency. A 1969 study confirmed it: strangers who did someone a small personal favor rated him more likable afterward than people who instead received a favor from him.