Insurance companies look at the “big picture” and they are likely subsidized by government to give out the vaccines. This is for general vaccines. You can look up the rules for each insurance company. They pay doctors a bonus if they give 10 vaccines per child for 85%+ of their patients.
On a macro scale, yes, maybe this covid vaccine works or at least doesn’t do harm. On an individual level however, there are significant risks that far outweigh the benefits IMHO, especially for children who are barely affected by the virus.