The national guard should be used in those types of situations. But this goes way further than that. We are now going to have the national government dictating policing policies at the local level.
"Sec. 4. Using National Security Assets for Law and Order. (a) Within 90 days of the date of this order, the Attorney General and the Secretary of Defense, in consultation with the Secretary of Homeland Security and the heads of agencies as appropriate, shall increase the provision of excess military and national security assets in local jurisdictions
to assist State and local law enforcement.
(b) Within 90 days of the date of this order, the Secretary of Defense, in coordination with the Attorney General, shall determine how military and national security assets, training, non-lethal capabilities, and personnel can most effectively be utilized to prevent crime."
It's much more about providing assistance than it is dictating policy. Section B is about figuring out how they can best assist