Honestly, that would be preferable to the reality. Unvaccinated children, by and large, aren't the people who suffer from their parents' shitty choices. I wouldn't want anyone to suffer, but if it were the unvaccinated children who suffer most, it would be easier to make the case to ignorant and selfish people who don't want to vaccinate.

No vaccine is completely effective, and each infection is an opportunity for mutation and spread. Not everyone who gets infected will get sick. Not everyone who gets sick will have severe illness or even the same symptoms. The people who suffer the most are the very young, the immunocompromised, the elderly, and the poor. If you're talking to someone who thinks their internet googling is as valid as actual medical doctors doing actual scientific research, it's going to be harder to convince them to do something for the greater good.