It’s unfortunate, but another nice novel idea from the past has been co-opted and abused by extremists. According to FlagAndBanner, a website that calls themselves The experts on flags and their meanings…
. . . The first use of the thin blue line was used in 1911 in a poem by Nels Dickmann Anderson referring to the United States Army.
In the 1950s, Los Angeles Police Department Chief Bill Parker coined the term “thin blue line” as the barrier between law and order, and social and civil anarchy. By the early 1970s, the term had spread to police departments across the U.S. Use of the term became especially widespread following the release of Errol Morris’s 1988 documentary, “The Thin Blue Line.”
In addition to the police, eight other public service branches have adopted thin line colors of their own, including the thin red line flag of the fire department. Flying a thin line flag shows support for the associated service branch, noted below:
The rest of the list can be seen by going directly to their website, if you wish. I don’t feel the need to copy their whole web page into this thread.
So, according to this, the thin blue line has been symbolic of support for law-and-order since the 1950s. I know what was going on at the time; I suspect but don’t know which side LAPD’s chief Bill Parker supported in those issues or if he intended the thin blue line to be particularly or exclusively supportive of law-enforcement officers (as opposed to support for ratified authority and laws).
With that symbolism being added back to people’s flags in the wake of the Black Lives Matter protests, the thin blue line has certainly become a reactionary effort to dilute and weaken the point of the protests. And then, with the thin blue line becoming popular, others have undermined that reactionary reaction by displaying flags with other thin lines, including rainbows for LGBTQ support and pink lines for support of women’s rights and – well, see the web site for more meanings if you wish. I, for one, would like to see a line in support of globalism (as opposed to nationalism).
The US Government has put forth no opinion on the matter. The official flag of the United States has no thin lines of any color.
And, by the way, there is no “American Flag” and there probably never will be.
The United States of America is one of many nations on the two American continents and there are also several Central American nation-states on the isthmus that connects North and South America.
–G!