Either try to make the world a better place (it is possible, small things are not wasted) or be quiet and stop infecting the rest of us with your apathy.
Edit: I really must stop being an obnoxious arse. Let me try again, then. Comments like that are damaging and self-reinforcing because they demoralise. A lot of people care and are decent but will not try to remain that way if comments like this corrode them - why should they, if decency is met with nastiness? Why even try? So please don't do this.