Hams care about people following FCC rules in much the same way gun owners care about ATF regulations, or car-club members care about whether modifications are steet-legal (or CA Smog-legal), or DIY forum people care about work being permitted and done to code, etc. etc.

Some of it is people being cranky, sure, but breaking the rules and regulations of a federal agency is generally not the best idea even if you don't mean any harm by it.