That's doesn't really answer the question, though. The point is from a purely selfish point of view, no one should worry about how their actions affect the future generations or the earth. They should just do what makes them feel good now.
It's not really a question of "should," but of relevance and pragmatism. I don't go out of my way to be wasteful or destructive, and am a natural conservationist and inherently efficient, but I won't make what I consider a meaningless sacrifice purely in the name of idealism. This is a bit broader than what is being discussed, but it is the context in which my comments were made.
However, most people would agree that that's not a very good point of view, and that we need to take care of the environment so that it'll be around in another 100-200 years. But that's a rejection of that selfishness. Are you really saying you embrace that selfishness, or do you think we should do what we can to make sure the earth and humans are still around 100-200 years from now?
Yes, I agree it would be good if "we" took care of the environment. However, I always measure everything between my individual actions against the reality of the actions of the collective. If I determine a particular action of "I" won't impact the inaction of the collective "we," then I'm not going to overly concern myself with what "we" "should" be doing.
Really, the context of my statements were more about taking advantage of capitalism, even if it is unsustainable in its current form and direction, in order to maximize and improve my life, since it is the system I'm embedded in, and any individual actions I take aren't going to mitigate any future damage done by this system. It wasn't really a comment on shopping at Wal-Mart or clubbing baby seals.