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Given that the people in the hypothetical holiday family already exist, I dont see the worth in shaming parents for their children, and effectively shaming people for existing. It's not productive, and bit of a nasty road to go down. Populations naturally stabilise in richer countries.
It's better for as many people as possible to fill up a vehicle to capacity, carry only what they need, than for groups of twos and threes to take a huge heavy thing fitted out like a small house.
Hi sorry for the rant. what makes campers worse than regular cars is carrying all the weight of cookers, showers, water tanks etc etc. Larger vehicles just have more impact. Using existing infrastructure and accommodation is much less impactful than taking it all with you, plus you boost local economies. But then maybe your camper just carries people, and you have a large family. I would simply suggest, travel light, leave nothing behind, use the train when you can, which it sounds like you probably try to do anyway.