Well sorry, its not opinion that to "jury nullify" that all members of a jury must collectively nullify... that is FACT... This statement in and of itself is incorrect. Any one juror could cause a mistrial all by themself. And that is nullification.
I would never hesitate to do so if my concience led me to do so.
No Nullification is not a mistrial... the defendant can be retried. The defendant is only let free and nullified of conviction if found not guilty by the jury despite the letter of the law. A hung jury is not nullification. Your opinion is highly blurred into what you perceive as fact.