Call me heartless, but I am more careful about who I render aid to now than I might have been several years ago. I've never been a fighter, but my muscles used to work a lot better than they do now, so I might have felt less vulnerable. I would be cautious about offering help to someone who is acting odd unless I was familiar with them or the situation. I have friends who act odd, so that's not always a deal-breaker, but odd people often do odd things, and some of these can be dangerous. It's been many years since I have even seen a hitchhiker now, as that is no longer a thing, but since I had spent a year and a half hitchhiking around the country, I felt obligated to pick up hitchhikers for quite a while, unless they seemed off in some way. Even as a hitchhiker, I didn't accept rides from everyone who stopped; some seemed off, and I would opt to go with my intuition, and I'd do that with people I offered rides to, as well. Today, like many other people, I try not to take notice of strange people in strange places. I have helped a fair number of people in my life, so I don't feel obligated to help everyone who seems to need help.