I am in the, violence generally is bad(unless a last resort or self defense) camp of this whole affair. Still, this is a prime opportunity to mix two issues together.
Since the MSM narrative is that this is an act of domestic terrorism, and is trying to tie this, to the movement; accuse them of making the same fallacy of all Islam = terrorism.
It will work as a short term counter-narrative, at least, throwing a wrench into an extreme association.
Yes, it could also be used against /pol/... but that then aids its spread.
BLM, and other equivalents can also be made.