Zero Tolerance regs are of no use as far as I can tell other than to remove 100% of the expectation that a rule maker/enforcer will be tasked with assessing a situation and using common sense in enforcement...
'Cause thinkin' and makin' a decision is just so darn hard!!!
Plus you might be held RESPONSIBLE for a decision you made (oh the horror!!!) Much better to rely on policy or 'precident'. (Echos of 'I vas only following orders!')
I covered a minor committee once that allocated funds and whenever someone found a 'precedent' everyone on the committee breathed a sigh of relief because that gave them an excuse if anyone objected to the allocation.