Unless someone was writing something that was directly encouraging violence silencing people should never be the response. I don't know who those "some people" that the article talks about are, but if they are mainstream then this could lead to people only researching things that they are sure would reach a PC conclusion. Or alternatively researching a lot and only publishing pc conclusions.
It's the infantilized "student customer" along with a long-standing infiltration of sectors of Academia with ideologically motivated staff that is enabling all that.
The majority of staff/students do not a agree with this, but there's a system of fear where you can ruin your career by being labeled racist/sexist (etc.) by one of these ignorant loudmouths.
We can't change this by calling for individuals to not act in a certain way, we need to dismantle this power structure inside (parts of) Academia. It starts with speaking up.