1) Single occupant car transport is the least space efficient mode of travel in wide use, with wide margins. That even includes dedicated rail, if reasonably frequented, as in a moderately dense city.
2) Phrase it as you may, parking minimums raise cost of housing and/or disperse the cities increasing distances traveled, turning cheap options of walking or cycling into requisite car travel, which again widens roads, increasing distances...
3) No idea if true. Even so, less cars and less oil should leave more available resources for more useful things. Bad funding schemes are an argument, but I would consider it a sufficient one.
4) Yes they were bad. Probably still are. Trains can be electrified and no idea how that relates to wars.
5) I agree car subsidies are bad. Not sure about feasibility or seriousness of proposed end on pedestrian subsidies. Would you stop building sidewalks? Roads?
6) I will deflect to a more pressing concern and argue car travel inflicted pollution collectively does significantly more harm to health and quality of life of most residents, than the few, yet no less tragic traffic accidents.
How about we don't incentivize car usage, including all the reasons that make it convenient, useful and often almost unavoidable, like zoning, parking, wide roads, cheap fuel etc? Car is a car, and in this instance, newer cars may be even worse polluters with their tire particulate.
7) Sedentary life style is not about length of commute. If you don't own a powered personal transporter, you will almost certainly either walk more or cycle more or at least stand on your motorized scooter as you do want to get somewhere.