I mean correct me if I am wrong sending in the National Guard/ Military and using force against civis breaking the constitution?

Depends on what the NG does.

They can be used as ‘protection’ which would mean a defensive role in the case of civilians engaging in violence. I think the Insurrection Act has to be invoked in order for NG troops to go on the offensive, but I only know what I’ve read online and am no expert.