I don't feel I'm heartless or selfish, I'd say I'm a realist.
And if it comes up in real life conversations I have no qualms repeating the same sentiments I've shared here. There's way too many people nowadays and trying to save them all(as bleeding hearts seem to want to do) is a ridiculous task considering we all die. So if you can't save them all the next best thing is to try and make everyone happy and comfortable which is as impossible as trying to save everyone.
The human race is eating this world up at an alarming rate(according to the world population clock we're adding around 2 million new people a day) towards two inevitable outcomes in my opinion. We either end up in some type of dystopian future where everyone is starving(think Soylent Green) and dies out or if we linger on long enough we all die because the sun has finally blown up(I don't think we'll make it this long). The other outcome is we figure out how to colonize and fuck up the rest of the universe. If you have kids or plan on having them(I don't) do you want this kind of future for their kids and their kids and so on? I'm sorry if this is too real for some of you to accept.
Now this doesn't mean I don't care about my family and friends. And I suppose you could say "well this is all easy for you to say since you're not starving" but if I were on the other side of the coin and starving I'd have better things to worry about than what some asshole on some message board thinks.
Richard Nikoley of Free the Animal articulates my feelings without all of the nihilism in this article - Another Simple Question: The Paleo Diet is Not The Way to a Healthy Future <i>For Whom?</i> | Free The Animal