I'm not aware of anyone on the right advocating that words are acts of violence. It might be possible, but I _know_ it comes from the left.
That said, that conservatives don't speak up more about this type of stuff is concerning. They are, after all, supposed to be about the business of "conserving" things.
That said, that they even published this letter is at least a breath of fresh air. Regardless of the view, I'm glad that there is a call to examine this.
Imagine if, every time someone wanted to talk about helping end the obesity epidemic, many other people chimed in about how dare you talk about obesity when cancer still exists. And the only way you could make a point about obesity is to put a disclaimer that cancer is totally worse than obesity.