I agree with the guy's points. Here's my version of it:
The free world, including our country, is embroiled in a war between those who want to be free and those who want to be unfree; that war is mostly cold but it is still very real. The war is being fought on three fronts: it is political, cultural, and religious. Those who levy war against freedom are absolutely ruthless, and totally committed to their cause. Ernie Chambers is an example of an officer in that war, and his behavior is a microcosm of it.
Ernie does not want the people he hates, meaning the good guys, killing the people he likes, meaning those who seek to prey on us. He knows who his friends and supporters are and he knows who his enemy is. Consider the gangs of liberal bigots calling themselves antifa and BLM for example. They only commit the violence they are known for because they know the police are there to protect them. Move the police out of the way and let Billy Bob and his buddies come in and in no time at all these wannabe thugs will be laying on the ground sucking their thumb and crying for their mommy. And this is true of street crime too, though to a lesser degree, since they are usually more careful in choosing their victims.
Likewise, the enemy of freedom knows the power in symbolism and in propaganda. Propaganda affects attitudes, making the subjects of it more likely to do what the propagandist wants them to do. Being armed gives a person the feeling of having control over his own fate, along with the responsibility that goes with it. And these attitudes are the nemesis of attempts to expand government control over us. Being unarmed leads a person to want a bigger and stronger big brother protector, with nothing restraining his ability to protect them.
I don't think any of this goes through the minds of anti-gun bigots. I think that's all figured out subconsciously. All they know is they have a bad feeling about citizens being armed. So they look for excuses to justify that feeling. And that gives birth to what we all know of as the lies of gun control.