This is a problem, here GP is a hero, a hacker, a free spirit. But there is no point in romanticizing such behavior.
If you find a vulnerability in a system, you disclose it to the people that should know about it.
You can do that anonymously, or you can alert people in a subtle way.
What you don't do is sit on it and brag to people what a clever person you are.
I just cannot attribute something like that to altruism.
Dismissing the whistle-blower as a "kid, that wanted to just fuck someone over" is hardly fair.
You pretend that someone cracking everyone's password is not a problem that the organization should address or even know about.
We should not turn our gaze away. "This is not my problem" is simply not a correct response. Snowden knew that, and yet, some people call him a snitch and a traitor.
What an interesting alternate reality that would be.
You misspelled "prudent".