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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.
Order of magnitude bigger eco-crime than driving a camper I would say (unless you aren't in a wealthy country)