User pay formerly-public-infrastructure is what I identified as libertarian. Would you also advocate for residents of high crime areas to pay more taxes for police coverage?

"User pay" is typically associated with regressive per-use taxes. It's perfectly compatible with socialism to ensure the cost of the road system is applied to only automobile users in a progressive manner. Relatedly, Finland moving violation fines are not a fixed fee and are proportional to income: https://nri.today/wealthy-speedsters-beware-finlands-million... Stop thinking "cars=default", they are not.

Legally criminal actions are violations against the state, which is why a prosecutor decides whether to file charges and does not need the consent of the victim to do so. We already have what you suggest with civil law and private security.