Why many vegans don't care about human animal exploitation?

I don't really understand why a lot of vegans go the extra mile to find a plant based product but they don't care if that comes from human exploitation. Few examples are most non-organic fair trade cashew, chocolate, coffee, clothing other than plant based options from big corporations like burger kind, McDonald's etc which obviously also exploit and kill non human animals other than humans.

I get that we live in a system that is forced upon us and being 100% ethical is impossible but I see lots of vegan completely disregarding human issues. Why?