Anyone who is consistent won't believe anything different just because it applies to them. If I think my country is overburdening its natural resources and is overpopulated (and I do) then of course I'll understand that I'm part of the problem. Happily, along with all other sane people, I think that once born people have the right to a good life so I'm not likely to try and end my own because I'm a self acknowledged part of a surplus population.