I wonder if you also question the power of a government to forcibly take money from the people with no or few children and give the money to those with many children.

This (allocation per child) is a policy very frequently encountered in a large number of countries.

It is also frequent in those countries to raise the level of the allocation per child immediately before elections, which leads to quite an inflated level after many election cycles.

Unlike with China's population control policy, I have not seen any questioning of these allocation per child policies from other countries, even if in that case the state also intrudes in the individual rights by extracting money from them.

That policy also results in some kind of reverse eugenics, because the more responsible people delay having more children until having the financial means to raise them, but because they are forced to pay higher taxes they must delay even more, while some of the least responsible people choose to have as many children as possible, with the hope of sustaining the family only or mainly from the state aid.

In my opinion all kinds of potential abuse from a government must be questioned, not only those for which there exists a tradition to be criticized.