Is there a plant rights movement?!
Answers: what exactly is their cause?
A plant rights movement is the shortest cut imaginable to humans dying of starvation.
You have to draw the line somewhere. I suggest you draw it at plants. If potatoes and soybeans didn't want to be killed for food, they should have evolved harder.
No there isn't. You should go start one. Get back to us then.
Only by ignorant, defensive omnis.