Why won’t George agree with Lennie that “this ain’t no good place” and that they should leave, even if he has the same feeling?

I don't think there have been many "good" places for itinerant workers like George and Lennie. They need money and this is the only place they can get it at the moment. Isolation and loneliness are the prominent themes in this book. George and Lennie have their dream farm that keeps them going