I can't agree that his fears for retaliation for initial noncompliance were justified. He wasn't maced for his initial noncompliance. He was maced for his continued noncompliance. Had he stepped out on his own, I suspect he would have likely been brought to the ground and handcuffed. But it's unfair to say the cop's reaction to his current and ongoing noncompliance is evidence of what the cop will do in retaliation for the initial noncompliance.
Just so we are on the same page, at what time in the video was it established the LT was not a threat?
The LT may not react well to threats. After all, he sure doesn't react well to authority.
I think they knew the LT was not a threat once they got close, with their service pistols still pointed at him, and saw that he was alone, attired in an authentic service utilities uniform, no weapons in plain view, and his hands were still outside the window. At that point, I think the Sarge should have breathed a sigh of relief, calmed down, and then permitted the LT to do the same. Instead, the Sarge continued his adversarial disposition as if he was dealing with a career criminal. The LT obviously did not feel comfortable getting out as the perceived hostility of the officers continued.
There are times when a jaded gunfighter attitude can backfire when LE deals with the non-criminal element. I am not intimidated by LE pointing firearms at me and really don’t care during a stop, but most people don’t see it that way.