If you're willing to do crash dummy shyt a lot of people will overlook your background. The *smart* ones won't, but most high school & post high school aged people who haven't actually suffered the consequences of bad choices don't follow an actual code or have standards, they're just grimy and only respect your willingness to do grimy shyt.
I wouldn't be surprised at all if Gibbs was basically a crash dummy and ran to the military after he figured out he was the chump.
I agree in general, where it concerned Gibbs I disagree.
I don't believe he was ever outside a day in his life.