People taking shits in the street does have a clear and concrete harm: worse sanitation, namely the likelihood of stepping into a pile of feces.

How does this analogy map onto prostitution? Higher rates of STDs? People get diseases from non-paid sex too. You don't like seeing prostitutes soliciting on the street? If only they could advertise online...

I'm still not seeing an explanation of how prostitution harms "bystanders and society as a whole".

It all stems from the same culture of permissiveness and individualism. The shit in San Francisco’s streets, the graffiti, the needles, etc., is a physical manifestation of the city’s underlying cultural degeneracy.

Again, I still have yet to see you or any other commenter explain how two people wilfully exchanging money for sex harms people uninvolved in this transaction.

Shit on the streets has a clear harm: worse sanitation, increased probability of stepping into shit.

What's the harm of sex work? "Cultural degeneracy" is an extremely vague and hand-wavy claim.

And for what it's worth non-individualist countries such as much of east Asia actually have substantially higher rates of prostitution than North America. I don't see the link between individualism and prostitution.