Most families are taking the whole family places at least once a week and the majority will do it even more than that.
Or a family can actually learn to get along? This has nothing about being 'too soft'. You've repeatedly ignored people saying that they want to actually be with their families and that it's easier to have two parents there when you're dealing with multiple younger kids.
Because they'd end up renting a vehicle multiple times a week. Families do things together. Financially it's a poor choice and if you're doing it constantly your wasted time adds up. Unless you live within walking distance to a rental place you need to drive over, get the rental, and then drive back. You can't take everyone with you to the rental place and leave from there because
you don't have a car that fits everyone.
It makes sense to rent for the less common things like a road trip or vacation but if you're looking at doing it multiple times a month it will cost more and you'll waste tons of time.
Again, most families are doing something together on a weekly basis, especially while the kids are younger. That's not an overestimate, it's a fact.
The original topic was minivans so your discussion of increased prices aren't completely true.
1. Gas - I'll give you that, it burns more gas. However, minivans aren't significantly worse than many of the larger sedans or wagons that you'll be cross shopping them against.
2. Maintenance - On minivans the increased cost of maintenance isn't that bad. On my van the parts aren't really any more expensive than car parts and it hasn't needed any more work than a car of similar mileage and age. Anyways, if you're doing things often with your whole family the maintenance costs per mile for one larger vehicle will be better than two smaller vehicles. When you've got two oil changes, two brake jobs, and two of everything else it really adds up.
3. Insurance - It's not just liability that's cheaper. Minivans are cheaper to insure across the board. They aren't stolen as much as other cars and the typical driver is driving it pretty conservatively. Don't believe me? Look
here, 7 of the top 20 cheapest are minivans. A good chunk of the rest are relatively boring cross overs.
4. Registration - On a minivan it's not any more expensive than a car in every state that I've been in
5. Environmental costs - You're ignoring the environmental costs as well, battery packs don't manufacture or recycle themselves.
As I stated before, with 1 or 2 kids you don't really need much more than a sedan or wagon but a minivan starts looking really good when you've got 3 or more kids.