The population has built in immunity to influenza. There's a combination of health risk and spread potential, and if you continue to limit the benefit to only one of the two, it's easy to distort the conversation in a way that benefits your point of view.

>Let the children build up natural immunity

If a vaccine is safer, why? Framing a covid infection as "natural" is pretty twisted. It's not like primates have been developing immunity to this strain of bat poop for millennia. Pretending a natural infection is better because its natural is reckless. I bet, and I could be wrong, most people who had chicken pox wish they had the vaccine instead.