Your not getting it and my opinion is hardly profound, simply plain common sense. Just because the garnishment may have not happened yet(?) doesn't mean that it can't in the future. As I pointed out, if enough people were to try this, you can bet the county would pull out every stop in it's bag of tools to nip any non-compliance in the bud. They are lenient in regard to non-timely payment ONLY because enough people comply and those who don't typically have bonafide reasons(poor, unemployed, etc) for being delinquent (delinquency is not a particularly good money management strategy).  
But hey, it's your idea so please do lead the way, show us sheeple how to start a revolt against UNJUST(aren't they all) taxes. Maybe it only takes one hero, and that hero be you. Even if you go down in flames, you can hold your head high even if lighter in the wallet( money isn't everything, of course).Looking forward to reading all about it in the RG.