You're just digging yourself deeper. The county doesn't collect property tax for the state. The money stays in the county, to pay for county programs. You know, like schools, roads, bridges, the sheriff's department... Your Kmart analogy doesn't work.
If Tennessee State Code 67.5.101 were revoked or otherwise struck down, it would give me endless pleasure to tell your bureaucratic counterpart at the tax assessor's office in Knoxville to kiss my ass. That sure sounds like a state function, even if K-mart -- oh wait... some local county office collects it.
And you've got to feel proud. Your taxing activities help perpetuate public education. Think of the key role those failure factories have in insuring our kids have adequate access to drugs, crime and teenage pregnancy. Why without them, we might be forced to actually reform K-12 education into something useful.
You should go get a more meaningful job like putting down animals at the pound or marketing cigarettes.