If it’s anything like what we did, it’s to allow the sled to get up to a decent speed before hopping on. If you are in the sled, it’ll be sunk further into the snow, and the dogs have a much much harder time getting going.
Instead, you run along with them, encourage them to get moving, then when the sled catches up to you, you hop on.
We had a “sled team” when I was young, and this was how we always did it in winter. (really, we had rescue huskies and trained them to pull for exercise, because they had a lot of energy). The summer bike rig was much easier to get them going on.
I think you might have missed something in your zeal, which is fine. We need more passion about such things. Just directed the right way.
But the point being made before your comment was that anyone should be allowed to sleep -at least in their own- car, which you seem to agree with. And any public parking places where a car can sleep should be fine for a human to also sleep within said car, which you also seem to agree with.
This isn’t about having a car or not, and its not really about sleeping in a car you find, it’s about how it’s used if it is owned by the person who wants to use it that’s being discussed. So if someone already owns a car and wants or needs to live out of it, we can agree that’s ok (everyone involved in this thread is agreeing here). And if there’s a place that is appropriate for cars to be whether anyone is in them or not, that place should be fine with people sleeping as well. (Pretty sure everyone is agreeing with that, too)
So, everyone agrees, yay! No need to condescend when everyone agrees with you :)
If you want to expand the topic to shelter wherever you find it, that’s a great conversation to have. It’s just not actually the one being had.