When I was twelve, I spent my time fishing, playing kick the can, and dreaming of a major league baseball career. I was not lecturing adults on global cooling or the dangers of DDT or any of the other now discredited media driven hysterias of my youth. But todays youth are different. They are far more politically active. The question of the day is, is this a good thing?
My guess is that like so many issues, there will be the same liberal/conservative divide. Liberals will by and large think it a good idea. Conservatives, not so much.
Children, by virtue of their age, have limited formal education. What formal education they do have comes almost entirely at the hands of liberals. They have very limited informal education or life experience to draw from. For the most part, they don't get paychecks and they don't pay taxes. They have no experience with the sophistry of politicians. They are less stable emotionally. As they mature and explore their world, they will often need the comfort and support and sense of belonging that can be provided by groups and causes.
For all of the above reasons, children are far easier to manipulate than mature adults. So they are a tempting target for agenda driven individuals. Recruiting children is a great way to swell the numbers for your cause.
Kids should be kids. There will be time enough later to confront adult issues. We shouldn't use them for our own political purposes.