Note where the incident occurred-in a police station.  A number of police officers are present.   Regardless, the wheelchair bound individual was dumped onto the floor.   The deputy did not hesitate even with witnesses present.  Apparently, none of the other police present confronted the deputy on the spot for brutality.  Obviously, the deputy had no fear of consequences for his actions.  That a deputy would dump somebody out of a wheelchair in public is very damning.

Something is deeply dysfunctional at that Florida police station.

But I wonder if this action was an isolated incident or reflective of a systemic problem throughout American police departments nationwide.  For every video of an incident such as this, how many others are not available on video?

In a healthy democracy, citizens should not be afraid of their police.  Unfortunately, the video reflects a disrespect for a presumed innocent citizen and a willingness to use casual violence without compunction on a non-violent detainee.  This video suggests that citizens should be afraid of the police.

The police are supposed to serve the public.  Somewhere along the line, this deputy has either forgotten or never knew the role of police within society.  The deputy will be punished because of the video but will his superior officers suffer as well?  Are not his superiors responsible for the actions of their personnel?

Is the relationship between the police force and citizens dysfunctional in American?  Is the video a small example of a systemic problem throughout American police forces or just an isolated incident?

It starts with the militarisation of the police, which has been ongoing since the early 1970s. US Police routinely refer to the population as "civilians"--and that's one of the more civil terms they use. There are far more contemptuous labels for members of the public out there, such as "NHI": "No Humans Involved." This one's employed by bad cops when someone the police see as "inhuman" (black, immigrant, poor, disabled, mentally ill, a prostitute) is the victim of crime. And it means that crime won't be investigated.
I would like to think that "bad cops" are in the minority, but my experience with American police, and that of my friends, indicates otherwise. A close friend of mine was literally beaten to a pulp by two cops, then brought up on trumped-up and politically motivated charges, with false data passed to the news media. He eventually got justice in the courts but it was slow. He was unarmed, did not attempt to defend himself--and was a maths major who weighed about 100 pounds. My husband has seen police use a billy club to break the skull of a medic (clearly uniformed as such) near a demonstration, break the arm of a child, and walk police horses across demonstrators who had lain down in a street, all on one day. I could go on and on. As for common criminals, I watched many horrific interactions between police and suspects (can't say whether they were guilty of any crime) whilst living in Black neighbourhoods in the US. Force was routinely used, guns were usually drawn as well. My neighbour's son, a nice, non-criminal University student visiting on the holidays, was almost killed when police shot up his car, having mistaken him for a crime suspect. In the same city, there have been at least three killings of unarmed mentally ill people by police in recent years.
As a result, I had a really hard time learning that police could at times actually be helpful and considerate, after moving to the UK.

Hillsborough County sheriffs.  Of course.  More proof of why no one in their right mind should ever live in a hole like Tampon Bay.  If you want proper white-trash, racist, brutal cops, western Florida is the place to be.  They'll make the LAPD's antics look like child's play.

Sheriffs are a whole different ballgame from cops in America, too.  They're generally rednecks, and much meaner and more drunk with power.

Where's your motherf*%&ing flag pin?