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There are some fundamental problems that your post reveals.
1) Fundamentally decent people really have no clue about the kind of "people" LE is called upon to handle.
2) Most people have no more clue about the realities of interacting with violent criminals than they do about running NASA.
3) Despite that, a lot of people opine in complete ignorance about how to do LE.
4) The two piece uniform of Adam-12 stereotypes is as useless as mammary glands on a bowling ball. In modern LE, allowing or mandating such uniforms is a
prima facie indicator that command staff are low functioning lackwits. The visible white T shirt is a target indicator (known for 20-odd years), and shiny/squeaky gear is unsat for the same reasons. That stuff is not a positive. It is a discipline issue.
5) What the real cops (SLCPD; troopers generally are not "cops", and if they are, it is in spite of their agency) were wearing is ordinary protective gear. The vehicles they use are ordinary protective gear. It's kind of like the ordinary protective gear that firefighters wear, except rarely if ever does the average person second guess something about which they have no clue.
6) MSHP's response until last night was despicable. I hope, but have no realistic expectation of it happening, that the Captain will be the subject of an IA and fired as he should be. I have seen in another forum (restricted access, LE subforum) an MSHP trooper assigned to that mess reporting how bad the mess really was. He said that for the first time ever,
he was ashamed of his agency.
7) Last night, they finally started to act more like they should have - as if they were dealing with a subset of violent criminals who were using the legitimate protestors as portable camouflage. LE is still not using near enough force. Each and every one who had a Molotov should have gotten a trans-occipital hot lead injection.
8) The legitimate protestors have the right to protest, and I will defend it vigorously.
9) That does not mean that they are correct in their understanding of use of force, or what happened. I do LE legal for a living, and I can assure you that most lawyers and command officers are unaware of the extent of their ignorance. Ordinary citizens are even farther out in left field, trying to decide between a football bat and a hockey racquet.
10) Command personnel (they are not "leaders" any more than I am a gymnast) have done a heinous job of educating the public. "Dereliction" would be overly generous.

They continue to allow stupid stuff to be put out as correct, and are far too cowardly to actually take steps to correct the horrid misunderstandings that most people hold and which are being expressed in this incident.
11) Anyone who has been out there huffing paint with Mr. Balko needs to study history. There was a time, say 80-90 years ago, where this kind of conduct would have been responded to with belt-fed machine guns, not inadequate amounts of tear gas.