With force, yes.
So you are back at square one.
We're not at square one. We're at the first point of conflict.
You say one unaccountable agency should have a monopoly on force, subject only to the will of tyrants.
I say that competing agencies should each be free to use justifiable force, subject to market pressures of stable customer bases, competition, and the looming threat that another agency will judge the force to be unjustified.
Force sometimes is rightly used. The State shouldn't be the decision maker.