Why do you care?

Someone asked me once:
-Why do you care?
He was referring to me caring for other people, for this planet, for good causes. He also went on to say that he considers the trajectory of my life unimportant and the fact that I care for others unnecessary.
I care not only because I want it, but also because I can't help it.
If I see someone suffering it's my natural instinct to try and soothe their pain.
If I see injustice it's my natural instinct to get involved and change that.
Even when those situations don't affect me personally I still can't just sit and observe.
To some that may be annoying and wasteful, to some others it can be dangerous and against their personal agenda...
But guess what, I pity you. I pity those who can't feel compassion and empathy, who can't see past their own selfish interest and gain, who can't give without expecting something in return.
I pity you because you'll never be truly happy. For happiness can be found profoundly when you're the reason behind someone else's smile. 

:)