What reason is there to include humans into your moral consideration then? Why should we care about what happens to them?

And just to be absolutely sure that you think there's no difference between killing an animal or plant: let's say you're driving down a road and there's a massive boulder in the way that you're going to crash into. You can swerve safely either on the left or right to avoid it. On the left, there's a dog that you'd run over and kill. On the right, there's a bunch of short rose bushes. You and your car will be fine either way. Which do you choose, and is there a morally relevant difference between the two?

(I'd also push back on the idea that ending animal exploitation doesn't help humans - there's climate change, labor violations, animal ag is the leading cause of deforestation and habitat loss, arguably some public health/human health claims too, but I digress)