You are correct of course. Most public use airports are government owned. Everyone wants the government to run like a business...until it affects their rent. If the airport was private, they could and should operate like a business. But as a public entity, politics come into play. Airport management is a political position, usually hired or appointed by local elected officials. Aircraft owners are typically active in their community politics, and don't like their rent going up. We raise our rent even a few bucks a month and the pitchforks and torches come out. I can't tell you how many times I've been accused of being anti-GA because of rent increases, even though I'm an aircraft owner, active pilot and CFI myself and my rent is also affected!
It is no different than the backlash City Hall receives when taxes go up. Everyone wants the services, no one wants to pay for it personally.