This is not a good argument. Children tend to have parents who can vote.

I see what you're saying, but I don't agree that it works this way. Parents' concerns for their children are far more self-serving than most parents claim. Consider that every "for the children" political agenda ever has nakedly ulterior motives--name one truly pro-child policy where children are directly prioritized at the expense of their parents? Consider the way that school schedules are oriented around their parents' convenience in spite of decades of studies showing the harmful health effects they have. During COVID we saw dramatic efforts to protect the elderly coupled with a push to reopen schools by parents tired of having to take care of them all day. Whatever you think of the restrictions one way or another, the prioritization of elderly was apparent throughout. These are the same parents who have repeated voted benefits for themselves at the direct expense of their children, saddling them with trillions of dollars of debt to support their own present consumption. I promise you, if seniors were regularly being gunned down like this they would have found a solution already.