They are afraid of the idea that people might be able to self-govern and be autonomous from state power. There is a LOT of vested interests that will want CHAZ to fail horribly and I am 100% certain there will be Agent Provocateurs active in the area.
I hope they can make it work and not too many people get hurt, but I fear it's a setup from the get go and it's only a matter of time until the stormtroopers get sent in to make an example of them all.
It's amazing to me how some people see this 100% differently (such as this comment).
Maybe people really are afraid of a group of people demonstrating practical self-sovereignty.