You can still help people if you ask whether you're going to or not. Presumably you wouldn't go around helping people commit/get/achieve evil things. It's just another selection criteria - what's your risk in all this?

Maybe that seems a self-centred way of thinking to you. Most people seem to want to believe that their actions are motivated by compassion. However, I don't think this is incompatible with a compassionate system of thought: if you're in a situation where people love you and vest their trust in you... where they invest in you in other words... do you really have the right to take a high risk on yourself?

Maybe you have children or a job or something - I don't know. It would seem kind of selfish to risk the welfare of your kids to help one person right in front of you. To risk, beyond just your kids, all the others who are networked with you and benefit from your presence for the welfare of one person.

You can stand to lose those relationships if people attack you socially, and those people can stand to lose you. The cost of helping the wrong person is potentially all, and to all, you love and/or invest in.

From a compassionate standpoint I'm not sure that's a trade-off that makes sense anymore than it would from a purely selfish standpoint.