I normally only counted my own personal costs and those were already quite high for driving vs public transport where it was available. I think if most drivers use an app to count all their personal costs they might already be lenient towards more public transport.
This one though is very abstract and will be very difficult to convince the normal driver. But if you look at that cost per mile, it is much worse than the own personal cost per mile.
It's what it costs you now, and you don't have alternatives now.
Maybe this will help you think about the future differently: be it planning to move or getting a different job so that you can use alternative transport, making smaller changes that would allow you to not use a car as much, or even long-term decisions like championing for change at the legislative level that might aid development of better transportation access.
Ii have no plans to move or change jobs anytime soon for various reasons. My area is very conservative, the only thing well-funded is police. Non-car infrastructure is a low priority, I'm very aware of the politics here. My best efforts are at state or national level even though things like bike lanes are generally decided locally. There just isn't enough political energy to get them to spend the billions we'd need to widen all the roads.