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Not sure what your point is here, as in the UK the average number of children per woman is <2 and lower than that for Europe as a whole. Increases in population are mainly driven by longer life expectancies and immigration.
Most wealthy countries actually have a fertility issue from an economic perspective, as current birth rates are unsustainable given the likely costs in the future to care for older generations.
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Somehow we have to discourage people in wealthy countries from deciding to have that third child
You'd have a much bigger effect on population stability by lifting millions in developing countries out of poverty so they had the education and power to choose the size of their families. Ragging on people with three kids in Hither Green might be easier but it's less effective.
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.