It was a choice but a completely unreasonable and unethical choice: train at Camp Hammond or have your powers stripped.
Which made those that resisted, refused and rebelled more heroic!
True, but I don't think it produced a lot of bright eyed idealist either. The kids were taught to kill, they saw the worst of the government, were treated like dirt, constantly under the threat of some sort of power removal... Kid sidekicks were always inspired by heroes to become heroes. Where was the inspiration to be a hero in camp hammond?