I don't think the Parkland comparison works, frankly. The Parkland kids are doing some wonderful work, but everything they are asking for is stuff that others have been advocating for years. They put a face on an already existing issue. This happens because Jon goes "Why not?" seemingly on a whim.
What would be a much better story is have Jon (ideally as a kid) confront issue that humanity is actually dealing with like gun control and discovering the difference between saving people from killer robots and working to make a difference in one's community, as well as the frustrations that can sometimes cause. That's something everyone encounters as they grow older. The reality of how hard it can be to make a difference. Not this nonsense.