I don't think you should feel bad for giving to people begging. I budget some money for this purpose. But giving money to poor people will not end poverty; ending capitalism will. The bulk of your available time and effort is probably better used fighting for structural solutions. So I don't think there's a moral obligation to like, seek out individual homeless people to give money to or something like that, but you are probably obligated to work towards eviction protections and public housing and stuff.