Poor sweet kitty.

This sounds a lot like me. If I see a kitty on the side of the road I try to either find the owner or at least move the kitty off to the side in a comfortable spot. If I have a towel or the like with me that is wrapped around them as well.
I feel it is something I have to do as I can not stand the thought of the kitty laying there forever, with no one to aknowledge that he/she passed away.