In what way? Because to me it's a pretty appropriate analogy.
Uhh, no. Not "just because of a verbal threat." The "good guy" did a hell of a lot more wrong than verbally threaten a guy.
Police don't pull their guns for every arrest, and they have far, far more training than this guy. They don't threaten to kill someone, and generally speaking, they don't kick people in the head after they're down on the ground not resisting.
I have to shake my head and laugh at people who think that what he did was totally fine, and justifiable, and legal.
Which is why so many have a problem with the use (presentation, etc.) of a gun here.