I have worked in the Law Enforcement field for the last 17 years. This is a partially accurate statement. Control freaks and bullies do definitely exist in law enforcement and I believe in greater percentages than in other fields on average. They ARE drawn to the opportunity to act out their control urges and bully tendencies with impunity, and they tend to gravitate toward smaller towns because the application and qualification process is not as stringent as it is in bigger cities and many do not conduct psychological or proper background testing. In fact, some move from town to town because they get hired in one small town and get fired for whatever reason that resulted from their bullying behavior, then move on to the next small town that doesn't do a proper background check.Given human nature, and the fact that the opportunity to wield power over others is provided by law enforcement, lots of bullies and psychopaths are going to want to be cops. Most of them are probably weeded out in the hiring process, but some are bound to get through.
But what is important to remember is that you also have FAR greater numbers of selfless, courageous heroes in law enforcement than in other fields. They are drawn to the career because of the opportunity to serve and contribute to their communities and help people.
In my time, I have met some real jerks but I have met many more great people that I am proud to call friends and would not hesitate trust my life with. Despite what many people think, not every member of the government and law enforcement is out to deprive you of your liberties.