I think libs are under the (false) impression that roads are both completely mandatory in society
They kinda are in local transport to be fair. You can't transport truck loads of stuff by bike to grocery stores. This necessitates some level of automobile road to get there. What's unnecessary is regional/national roads for commerce. Most cities would still require road maintenance just for EMS and local commerce even if they had a robust public infrastructure. The good news is that buses can use these roads as well so a post-personal-car future is still viable. Roadless cities are not.