Police dashboard camera video shows Robinson arresting Vasquez for the expired sticker.
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It wasn’t necessarily an arrest at that point. As part of a Terry Stop, the officer may place a person in handcuffs. This would have been legitimate if Vasquez was being belligerent.
From http://www.legalupdateonline.com/4th/45
Exceptions: The use of firearms, handcuffing, a non-consensual transportation, and/or putting a subject into a patrol car, if necessary under the circumstances, particularly if precautions are taken to make sure that the person knows he is only being detained as opposed to being arrested, or when the use of force is necessitated by the potential danger to the officers, may be found to be appropriate and does not necessarily elevate the contact into an arrest. (See People v. Celis (2004) 33 Cal.4th 667, 673-676.)
You’ve been reading too many cop books...
Get a grip.
When Vasquez exited the car and attempted to show Robinson the dealer plates — which would’ve exempted the necessity for up to date inspection tags
You'd still be making excuses for Roland Freisler, if he'd survived the fortuitous bomb through his courtroom...