Florida, 2020: 63,217 domestic violence arrests
The British arrest stats subsume DV harassment cases, and the original Times reporting quoted a police officer stating that they are the bulk of these numbers. I haven’t found an apples-to-apples comparison in the US, but the FL number gives a point of reference.
Addressing the hypothetical person you’re describing: car infrastructure may solve some needs, but it is in direct conflict with other needs. Give every adult a guaranteed parking space just at home and at work, and the physical space required for that alone is an unbelievable double-digit percentage of the city area. Cities are so valuable because they pack a lot of amenities and markets (including your family’s schools and workplaces) in a compact area. Place everything significantly further apart, add more concrete and noise, and you’ve lost on all fronts: safety, charm and efficiency.
The general topic and some specific ways to estimate a correction are described under this term: https://en.wikipedia.org/wiki/Sequential_analysis
(Maybe I’m reading too much of a narrative into what you wrote, but–) I don’t think it’s causal like that; it doesn’t have to be. In particular, “wealthy, modern urban cores” tend to be self-sustaining economic force multipliers rather than parasitic resource sinks or vanity projects. Each specific megaproject might be one of the latter, of course. In general, however, I’d be careful about mixing up different public choice failures. How easy it is to: (agree on a fair way to) collect public money, identify and agree on some kind of public benefit, allocate resources to further that interest, execute projects without snags – etc.