>reducing the harms to marginalised people from being exposed to threats to their person, identity, and way of life
This only makes sense if you use a recent definition of "harm" created by censorship advocates that's divorced from the traditional meaning. In criminal law, harm traditionally (and still does in America) mean actually physically harming someone's body or making threats to do so. Censorship advocates are the ones making the claim that mere words should also constitute harm, so the onus is on them to justify why they want to change the meaning of the word like that.
This only makes sense if you use a recent definition of "harm" created by censorship advocates that's divorced from the traditional meaning. In criminal law, harm traditionally (and still does in America) mean actually physically harming someone's body or making threats to do so. Censorship advocates are the ones making the claim that mere words should also constitute harm, so the onus is on them to justify why they want to change the meaning of the word like that.