Not everyone that Luffy encounters becomes his friend or even an ally.
But what’s wrong with Luffy helping people? Isn’t that part of what One Piece is about? Going on adventures, meeting new people and helping them if they’re in trouble? That’s been the pattern since Alabasta—No, since Episode 1.
It seems you’re just trying to find reasons to hate an arc that just started. Wait for more information on the chapter to come out, will ya?