Plants are alive .
Animals are alive.
Plants feel the pain.
Animals feel the pain.
Plants don't express pain in fashion recognised by humans.
Animales express pain in fashion recognised by humans.
Hence some people feel it's okay to kill plants but not animals.
It's all about humans bro. We made all the rules. We would cry of someone stole our piece of land but we forgot that we took it int he first place from some other wild animals. But we are humans ..toh it's okay..
We humanes define everything as per our convince ki what is okay to do in this world and what is not.
We are okay to buy special equipment to kill cockroaches, while we certainly won't be if cockroaches decided to team up and kill humans.
We are humans and we are all biased and unfair to other life forms.
We are just fighting on what level of unfairness is okay and what is not.
But then look the world from a third person's perspective and you will see everything thing unfair is beyond the limit.
I am pretty sure that not every cow gives the consent for it to be lactated for industrial purposes for an entirely different life form.