Earlier quoted context omitted.
> Vegans describing other people as murderers. Well, this is literally true if you consider non-human lives. The danger I see is then not listening to and interacting with these non-vegans to develop a more nuanced perspective of the people on "the other side" who may not be very different after all. Stating a legitimate political or moral view alone is not (itself) what induces polarization, as I see it.
https://en.wikipedia.org/wiki/Murder If you want redefine language, that is fine, but in real life I will not accept being called a murderer. 1984 was not a manual.
What do you mean by not accepting it? You're welcome to disagree with the classification, of course. That's how we start a hearty discussion on values, morals, politics, etc.
In real life, I would also hope that I use a more tactful strategy that doesn't immediately fall back on a term that will polarize my interlocutor.