So just in case anyone missed it, I want to spell this out for you. The point of using FPS as ICE agents is that FPS is stocked full of troops from EriK Prince's private army (now called "Academi" but formerly called "Blackwater"). This means that carrying out ethnic cleansing can dump money directly into the pockets of America's version of the Wagner Group (side from, of course GEO Group).
It also means that there can be an alternative chain of command that exists outside of official channels. ICE is already bad enough, but similar people have worked as mercenaries for a long time. Having an established chain of command over armed occupiers, one based entirely on economic incentives, one that can't be legally monitored or audited, one that's completely outside of the government, should be especially worrying.
The bit reason J6 didn't go as planned is that Erik Prince wasn't behind it. Now there are troops with experience occupying American cities who can be called directly via Erik when Trump wants to make sure he doesn't lose again. And Erik won't back out at the last minute, because he's already seen that there will be no consequences for participating in a coup... if the time comes.