Again, I don't really see how important of an issue this is for several reasons.
The people being "canceled" for gravedancing are almost entirely ideologically motivated progressives and leftists who are openly promoting their support for political violence being used against their opposition, on main accounts tied to their public identities. I think it's completely valid that any right-leaning person out there wouldn't want these people teaching their kids, administering their healthcare or even making their coffee. I also see it as a positive that the right is finally willing to impose some kind of cost on its enemies, even if it's in this form. If you're American, do you think you could have gotten away with celebrating George Floyd's death on normie social media with your real name attached without something like this happening?
There's a tradeoff here where we're weighing the benefit of imposing costs on the ideologically motivated left vs. the cost of alienating neutral people or causing backlash. Is it worth more inaction and more occupation of the "moral high ground" in order to avoid any backlash?
And what alternative course of action are you offering?