I want these people expunged, too. However, there is huge danger in establishing more buttons and switches that authorities can press to 'make us safer'. The people who passed the USA PATRIOT act created a bunch of them. One led directly, specifically to children in cages and the horror of the treatment of immigrants in this country.
I don't yet have an opinion about the specifics but I worry very, very much that instrumenting the US government with the ability to control the domain name system a terrible thing to do. It's great when Biden stops parler.com. A lot less great when President Josh Hawley does it for plannedParenthood.com. Perhaps horrific when the domains that Apple uses for iMessages are shut off. Or the ones used for signaling by ATT and Verizon.
When people complained to me about Apple refusing to hack iPhones for the police, I have always said that the police managed to investigate crimes without that throughout history. They can still do it. Same with these anarchist groups.
I am fine with the actions being taken right now to deplatform violent speech. Apple, Google, Amazon, Facebook, Twitter and the rest are not required to do business with vile people. I am very, very reluctant to have the government control it.
Also, I do not actually think it is wise.
The reason we can shut Parler off and remove command and control (Trump's Twitter) is because they did not feel threatened and did their nasty work with obvious tools. If we make it too difficult for them to exist, they will adapt. Denying them access to tools does not cause them to cease to exist. I will cause them to get smarter and harder to detect and manage.
The fundamental mechanism of evolution is existential threat. If we provide that, they will evolve. I think it's a mistake to imagine that silencing them will work in our interest.