I don't see any correlation between this video and what you are talking about.
Do not know the facts, my guess is this guy said something very offensive and the officer lost it.
So should your title not be "should a person be able to beat down someone for talking smack without penalty?"
Right wingers don't care about the laws, only their Russian inspired bigotry.
A person may not be deprived of life, liberty, or property without
due process of law or denied equal protection of the laws
The last I checked, it was the left that doesn't care about the laws that are on the books.
Arson of buildings: A felony. The left's stance, "let the arsonists burn the small businesses in their own area."
Looting: A misdemeanor or felony, depending upon how much or how expensive the objects are. The left's stance, "let them loot those local businesses that they burn down.
Battery on persons: Depending upon how severely the persons are harmed, a misdemeanor of felony. The left's response is, "let them get their anger out of their system.
It's the left mob that is deliberately depriving persons of the lives, liberty and property and it sure isn't part of a "due process of law."
If you try to accuse the cops of waging a war on blacks, the cops don't go into neighborhoods and randomly select some black sitting around doing nothing. They are called in to areas because of criminal or unstable behavior. Almost all of those blacks that have been killed by cops, were "habitual" criminals, in and out and in and out of jail and prison. In each case, they were resisting arrest, with the operative word being, RESISTING! If you resist arrest, you are certain to escalate things negatively for you. Bringing in people that are or were committing crimes, is mandatory. They can't just say, "Well, hell he/she is black, so we can't arrest him/her." Laws on the books are enforced, whether you are black or white....and for the record, more whites die at the hands of cops than blacks.
Oh, and as for "due process of law," your leftist politicians have made it clear that they no longer want the "freedom of speech" or the right to bear arms, or....due process. To them, if someone is accused of something, they're guilty. Just ask Brett Kavanaugh.