Imagine you're standing in front of a bear cage. Imagine if that bear cage was going to open in the next ten seconds. Imagine there was a button on the wall that you could press to keep that cage closed. Would you press it? Would you want other people to be able to press it if they were your situation?
The example doesn't even have to be that drastic, imagine any good or bad consequence at all. It would be advantageous to have a button that controls whether it happens. Right now we are not in control and humans have always striven to have control.
My sense of self-preservation it not just for me - I feel it for all of humanity, present and future. If you still disagree with me that's fine but if you're going to be logically consistent while espousing the belief that humanity shouldn't exist because we use too many resources the generous thing to do would be to off yourself first. Please don't though, instead help the rest of us figure out a way for more humans to live happily while improving our current world. There is no reason we can't. None. We just haven't figured it out.