You can drop the word "police" from the title. And then drop the rest of the title too. This is just what unions do. That's what they were created for.
18th-19th century trade unions, of which this union is a modern descendent, can be directly linked to Luddism and other forms of anti-progress mentality. Examples also abound throughout the 20th century and today.
What you're saying in your reply about unions being Luddite is obviously not a simple "historical truth". That's highly debatable, and it sounds like you're bringing it up as part of a generic argument about unions which is not particularly on topic here.
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Unions were created to equalize the negotiating positions of both parties when establishing the terms of labor contracts, or rather, to give laborers a position more equal to that or management. There are plenty of unions who don't then use this power to enable and protect the anti-social behavior of their members.
Also, different lines of work select for workers inclined to different social pathologies. Police work tends to appeal to people who are comfortable using force to dominate their neighbors; who are comfortable in an authoritarian relationship to others where some issue commands and others obey without question. This selects for different anti-social tendencies than you're likely to see among garment industry workers, say, or agricultural laborers.
I don't remember why I replied to your comment and not the others. It may have been that the reply was less substantive and more flamey. It may also have been that I didn't see the others. I certainly wasn't singling you out.
Or is it that you agree police unions are good, but know you don't have good arguments for that view, and so are trying to divert the discussion away from police unions and over to unions as such?
My own view is that calling unions all good or all bad is simply mistaken. They are a mix, and the proportion depends greatly on the case. I see police unions as one of the cases way over on the bad side. Do you disagree?
Are they good or bad? Depends. If you're in law enforcement, your employer is the government and you probably don't have a lot of choices of employer besides the government, so I'd say in that sector, it's a good thing to have. And the opposite for tech, where competition for workers drives wages and benefits up, and unions would only get in the way of that, and drain resources for their fancy offices.
And last, not everybody lives in the US. I happen to live in a country whose growth and prosperity is directly hindered by unions who spend lavishly on offices and cars for their officials, but do very little for the rank and file, while stifling innovation, of course.