Can we afford to keep charging fares?

Most of the costs of public transit are paid by taxes. Percent of revenue applied to costs is usually stated something like this:

• 40% stated percent of revenue from fares

but the actual numbers are more like this:

• 20% actual percent when capital costs are included
• 10% percent remaining after fare-collection costs are considered
• 00% percent remaining after fare-enforcement/fare-security

So fares are not needed for revenue. Then, can they be justified for rationing?
Fares, or user-fees, ration use to prevent misuse. But public transit is a part of your city that makes things better when used more, whereas cars are a consumer product that make your city worse when used more.

So, we cannot afford to ration public transit.