No, you would not have "convinced" each member of anything. I was a jury foreman on a Federal court case involving "sworn officers" (who withheld evidence in a high profile murder trial) and we had one juror who tried to "convince" everyone his "opinion" was unconditional. I told him his opinion would be discussed with the same merit the other 11 members would. Those deliberations lasted over a week until we finally agreed upon a verdict. Interestingly enough, it was he who "modified" his opinion after much discussion for us to reach a unanimous decision.
That said, this officer fired 5 rounds at a man crawling on the floor with his weapon (and other officer's weapons) trained on him. The officer had enough time to make a decision to fire, even if that individual did pull a weapon from behind his back. He definitely overreacted in this situation.
Meh. Maybe I jumped the gun so to speak. Generally speaking though. I'm pretty convincing when folks aren't so close minded that they can't change their minds.