How much would I risk for a stranger

I've noticed that people would risk plenty for a stranger. I potentially am not one of those people. It is not that I hate helping people. It's just that no one knows how much you can trust a stranger. Actually, it all depends on the favor. If they need directions or something like that I would not mind helping, but if they ask to borrow something all bets are off. For all we know this guy could be an FBI most wanted criminal. Or it could also be a saint who does everything he can for the benefits of others. Either way, there is no way of telling the two apart. He could also be an excellent liar.