I think the police, from the smallest township PD up to various Federal agencies, will all follow orders. Any orders. Even orders to disarm all US citizens. A few will quit, a few more will grumble ... but they'll do it.
Don't kid yourself otherwise.
Oh, and the military?
They'll do it, too.
Gotta keep those terrorists from causing trouble.
There's a reason for the Posse Commitatus Act, and for the Second, Third, and Fourth Amendments.
I agree with you 100%. They will all follow orders.
And, if someone manages to cripple certain parts of the country (Fukushima fallout in AK and the NW, just for one example), massive and constant tornadoes in the MW, etc., there will go large segments of gun owners. It will be easier to corral the libs and easier to find snitches when a huge number of us are gone.
Or, we are too sick and weakened from the constant aerial assaults (geoengineering to fight phony global warming, for our own good) to fight back.