It's your sympathy, you try seeing life from their perspective and how they feel, wanting to change the world and make it better we feel that it's up to us. It happens, whenever I used to go out with my mom to the bazaar I felt bad for every beggar and my mom used to give money to some of them but she couldn't just give it to them all she said "if we keep giving them the money, how will they learn how to stand on their own feet and be independent, we can give to the old people and the ones who are too young to start earning but not to the adults because they are capable of making money if they work hard" and that stuck to me. But seeing someone else's pain, like not only the beggars but everyone, even animals without a home and all. It feels different.

Human decency is a powerful thing. You never really think about what people go through tell you are there to see it first hand. Seeing a homeless person in a movie or on the news doesn't give as much of a click in your brain as seeing it for real. Remember to humble yourself.