Laws like "do not kill", "do not steal", have been found long before politicians existed, by the natural selection of societies. That is groups of people who did not follow these laws were largely outcompeted by those who followed.

If you decide to break the law of "do not steal" in large extent you get millions dead like it have happened in communist Russia or Maoist China. If you break it in smaller extent (e.g. by very high tax) you get stagnant economy like in EU.

In contrast to that, the laws banning children to work were adopted at the point when children did not need to work, so they are largely irrelevant. If these laws existed in 18th century London or Paris they would cause many deaths too, since there was no other way to feed these children.

So not all laws are given by politicians.