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It's not just that they have to believe in private property, they have to believe that private property exists as something other than a social agreement to let you have stuff for mutual benefit.

private property is private property Period.

. If your theory of property is, for example, that something is your property if other people agree to let you have it as part of a system of mutual benefit, then taxation takes property that is not yours, and thus cannot be theft.

That is scary, is that how the communists see the world?

yes you make a good point... the argument of taxation is theft depends on a rational sane person who understand that property is private, and we cannot bother arguing with communists who are irrational mystics like @mughat would say :D Mughat has taught me so much. As has @inertia