I care because I have to live in the same house with the bully. You should care because he is also known to leave his own house and beat the kids on the next block whenever he starts feeling insecure about himself. And he carries a damn big stick.
All right, I concede that maybe "to care" wasn't the right verb to use. In the proper sense I do care because I strive to do all that's legitimate for a non-US national to do to change this (IMHO) for the better (with the obvious boundary of preserving US nationals' freedoms).
Beside that, I don't care.