ask them if they believe this statement to be true: if A = B and B = C then A must = C.
if they say they believe its true then as them if they think this statement is true: Initiation of force = immoral, Government = monopoly on the initiation of force therefor Government = immoral.
That will blow some minds, also it doesnt matter if they think the above statement is true, it is. I was just simply saying give them the choice to see what they say.