That's because they're even more heavily subsidized than the public four-year colleges.
That is because CCs are directly reliant on subsidies, whereas 4 year colleges often have vast endowments that provide much of their funding. However, States are now realizing this and pointing out that if 4 year colleges have multi billion dollar endowments, then why do they need so much State subsidy?
But compelled to use those endowments, it will not be long before 4 year colleges need just as much subsidy as do CCs.