Did you not read TFA? The outcome is not positive for any party. Bigger cars consume more gas, kill more people, etc, and people buy them because they can. That’s a failure of market forces to do the right thing.
The outcome for the buyers of those vehicles is estimated by those buyers to be positive. I don't know if it is or isn't, but it seems at least a little presumptuous to conclude that a third party (you or I) knows more about the buyer's preferences/value function than the buyer themself.
If the outcome were known to be negative for everyone, it would be a lot less common.
The costs will change from society to society, but given the mix of vehicles in the United States and the structure of our health care system I feel confident that A) the accident cost are higher here and B) those costs will be distributed in less equitable fashion.
1 https://stopclimatechange.net/fileadmin/content/documents/mo...