I get it. I’d vax my kid, but there are people out therr who aren’t crazy or ignorant who are thinking, “Ok, this vaccine was rushed through without any trials on children, without any long-term trials it would normally go through. After it was approved they discovered some blood clotting issues. Who knows what we’ll discover five or ten years after vaccination? Who knows what it might do to a child’s developing body after several years? So there is some risk. In the meantime, the risk of Covid for children appears to be very low. I think we’ll wait and see for a bit.”
Add to that general distrust of politicians and public experts who keep trying to manipulate the public by lying to them (such as early on telling them masks aren’t effective because they wanted to save them for health care workers, or saying that the virus isn’t airborne and anyone who says it is is lying, or saying it’s a conspiracy theory to believe it came from a lab in Wuhan and censoring people who say it), and you can understand how even smart but not scientifically educated people can draw the conclusion that for now they are keeping their kid out of it.
There are vaccine hesitant people on both sides of the political fence. One of the biggest moments for fostering distrust on the right was when the public health commumity said that lockdowns were critical, but if you were marching for BLM it was okay. In that moment, large swaths of people on the right simply stopped trusting public health officials, and the paranoid ones saw it as evidence that the whole thing was a political manipulation. It was a huge mistake to politicize the lockdowns in that way.