Another lawyer answer: it depends.
Complaints are a fact of life in modern police work. I have reviewed complaints where people who were pulled over, very emotionally argued that the officer who cited them over for driving through an active construction zone (hypothetically) was rude, unprofessional, and just a bad person. Reviewed the dash cam, which (hypothetically) showed the person doing exactly what the citation stated, and the officer acting professionally, and the driver being rude, inconsiderate, and arrogant. I've heard some officers, whom I respect, say something to the effect that if you don't have at least a few complaints, you're not doing your job. I wouldn't go that far, as many, very good, officers go years between complaints.
But, at the same time, a "simmer" of complaints can show that an officer is screwing up in relatively minor ways, but has the potential to go "big" at any time. I've certainly seen that before, too. And, it can be VERY hard for a department to know when to make the move to get rid of the officer. It can be particularly hard when that officer does a GREAT job in other areas.
Very few people in the world are truly good or truly evil. Most are a mix of both, to various degrees. I have no trouble believing that Ofcr. Harless could behave as seen in the video, but be a great guy to work with most of the time, and behave admirably in other situations.
As a department, if you move too late, you are vilified for not recognizing a "bad apple" and getting rid of him earlier. If you move too early, you are vilified for turning against a good officer for petty offenses. I have - personally - seen both sides of that fence. You just try to get as much information as you can, and make the best decision you can under the circumstances.
To make a short answer long, 16 complaints in 8 years (1 every 6 months give or take) seems like alot, but it is really a case-by-case determination.
