That's because some believe morals are a human construct. So of course they don't believe in moral or immoral choices. They believe - like you do - that morals are made up. That there is no real such thing as good or evil. That all that exists is survival, pleasure and pain. Are you suggesting there's something more? You can't have it both ways. I'm getting sick and tired of people who try to have it both ways. You can't believe that morals are relative and expect anyone to accept your morals are the moralistic beliefs that should be followed as if they were absolute. Double standard much?
Absolutely I believe in gravity. That's why I don't jump off of buildings. Because I know that gravity will make me fall. So I disagree that there is no belief involved. Maybe you are confused about why I believe in gravity. It's the same reason I believe in God. Personal experiences. I have personally experienced the effects of gravity, so I know gravity is real. I have personally experienced the effects of God, so I know God is real. I didn't need Newton to tell me what would happen if I jumped off of a building. I knew what would happen. I only needed Newton to tell me how much force my body would experience when it splattered onto the surface.
Isn't that the point I was making? That you are making moral arguments you shouldn't be making. It seems to me that moral relativity much more closely matches nature. It's not immoral to survive even when that survival is at the expense of something9th 9 else. How is that not relative?