The main example that comes to mind is anything having to do with the environment. “The kids” will face the brunt of our actions (or inactions) on that front so a “for the kids” argument is completely valid. Dismissing a proposal simply because of a “for the kids” element is incredibly reductive and will genuinely end up harming kids.
“For the kids” arguments are distinct from arguments worrying about future generations in that they are almost entirely focused (ostensibly) on preventing harm to children while they are children rather than “all our descendants including the adults”.