I think the answer is more complicated. Why do security companies hire convicted black hat hackers to do security? Why does the government employ convicted scammers and fraudsters to investigate scams and fraud? Because the qualities that let you see something clearly are also the qualities that can make you vulnerable to it. Which is why integrity is so important.
I'm irritated (lol) by the implication that the person with no irritations is the one with no vulnerabilities. As if being tolerant and permissive of all things is the correct way to exist. That there is nothing worth feeling strongly against because it implies to others that you are guilty of it, and so if you don't want to "out" yourself, you must not feel strongly about anything.
EDIT>> I think I'm saying that "integrity" and "capability" are two dimensions of this idea, and that they are orthogonal. Low capability, high/low integrity = mostly harmless. Low integrity, high capability = hurts others. High integrity, high capability = helps others.