To clarify I wouldn't expect most people in a Christian country to help without an alterative motive either. ( this study comes to mind though I think my option was formed more from general experience.) I have met a few people how genuinely like to help for helping's sake but I think a larger percentage need some additional motivation like an expectation of a likelihood of reciprocation or perceiving the person to be helped as in-group like.

Also, I apologize but my dyslexia kicked in and I mis-read 19th canter as 21st century. If you're willing to settle for 21st century liberalism that is the intellectual foundation of social justice activism I have heard interesting things about "The Givingness of Things: Essay" though I haven't read it.