It was difficult to read any further after this quote, Dr. Spock. Young children understand a lot more than people give them credit and they are constantly testing the boundaries. Discipline and love go hand in hand when raising a well adjusted child. If what you're saying is that it's really the parents' fault I can agree with that but that still doesn't mean an authority figure should cower towards these types of behavior. That's all part of the issue that even in school environments the children know how to push buttons and play the game while pushing the limits.
Not sure the need for nicknames, but I was always a bigger Star Wars fan than Star Trek. Regardless, no one has said they need to cower towards a behavior in any way, but I would ask what is the intended outcome that the officers wanted to achieve? If their intent was to return the kid to the school, they executed that plan poorly. If their intent was to scare the child straight, they are clearly ignorant to the fact that methodology has no impact on children, especially at this age. It seems to me that they lost this power struggle because they escalated the situation rather than de-escalating the child and then enforcing whatever punishment is appropriate.
I am not sure why you were unable to read further after my statement, but from a developmental aspect, five year olds are not able to fully comprehend the magnitude of their decisions. If you've had children, you know this is the case. Kids at this age will say and do things that they hear around them for attention without regard for the impact it has on others. They will often act incredibly irrationally and will resort to more violent and outburst types of responses to various problems. At this age a child will react in whatever way they have learned that will get them what they want, which is nearly 100% of the time, attention. This is why five year olds take their ball and go home when they are mad, or punch someone without thinking. They are still experiencing what the social constructs of our society is about and it is our job to model appropriate behavior and responses.
If the intended result of this incident was to intimidate or threaten a five year old into compliance, that is beyond inappropriate and wildly ineffective. Screaming and threatening a five year old has no effect because there is no follow through and thus you have taught him to challenge said boundaries further. Tough love doesn't work on someone who is irrational and out of control, nor does it mean you need to have someone scream at you. Hold the kid, and parent(s), accountable for his actions, but what good does it do to threaten someone with no intent of carrying out the threat? To me the officers were operating at the child's level, which is unacceptable, and while they, and you, are free to hold those opinions about this child, it does little to no good to voice threats or scream at someone who is unable to process what you're saying. If you're married, it is kind like telling your spouse to calm down when they are already mad.