Humans are moral agents, though. Just because something happens in nature, that doesn’t make it okay. There are lots of examples of rape among wild animals, but that doesn’t make it okay for humans to do it.

A lot of vegans are concerned about climate change, too, but it’s really tangential to the philosophy. Veganism came out of the animal rights movement, so it’s really concerned with exploitation and suffering. If there were no environmental issues with animal products, vegans would still be vegans.

Plants may react to damage, but that isn’t the same thing as pain. Plants don’t have a brain or a central nervous system.

Plants aren’t sentient, so yes.

Here’s a good video on why vegans don’t eat honey. Beekeeping is really just another form of factory farming.