I don't know about that. Why else would building a colosseum in Civ 1 make three unhappy people content?

Are roads politics?

do i have to use the stadium to get to work? or provide commerce, police or medical coverage?

What does that have to do with politics? None of those things you mention are any more political than sports. I don't care about you getting to work or receiving medical care any more than you care about my sports.

Politicians pass bonds and laws which force people to allocate a portion of their tax revenues to sports stadiums. That should not happen.

Taxes pay for roads - which is a critical infrastructure for all aspects of a modern society. This is an appropriate use of tax funds.

Stadiums are not critical infrastructure, and should not be paid for with public money.

I cannot fathom how this confuses you.