But in the end, it's a basic biological fact, unless a form of life can photosynthesize, it likely consumes some form of matter that was likely from something living. Extremophiles that eat sulphur and minerals and such aside, the majority of non-photosynthesizing life consumes organic matter. Said matter was at one time from something that was alive.
In the end debates about whether plants or animals suffer the same or more seem sort of moot. Life involves suffering of some kind for every living thing on this planet. It's another one of those inescapable facts.
I agree we should all try and minimize the amount of suffering we directly cause, but every day something somewhere suffers because each of us exist. Trying to pretend we can erase any and all suffering we may cause ever is a fruitless effort.