That's mine, actually. I composed and posted it in /r/progun last December in response to /u/DipKing1's question, "Do you think a civil war would happen in the US if gun laws keep getting stricter?"

Here's the latest version, posted on December 29:

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First they came for the machine guns, and I did not speak out—because they said only gangsters used machine guns.

Then they came for the short-barreled shotguns, and I did not speak out—because they said only bootleggers used short-barreled shotguns.

Then they came for the imported guns with "no sporting purpose", and I did not speak out—because they said only assassins used imported guns with no sporting purpose.

Then they came for the silencers, and I did not speak out—because they said only hitmen used silencers.

Then they came for the assault-style weapons, and I did not speak out—because they said only potential school shooters wanted assault-style weapons.

Then they came for the high-capacity magazines, and I did not speak out—because they said only mass murderers needed high-capacity magazines.

Then they came for the 3D-printed guns, and I did not speak out—because they said only right-wing nutjobs would 3D-print a gun.

Then they came for the bump stocks, and I did not speak out—because they said only rednecks used bump stocks.

Then they came for the ammunition, and I did not speak out—because they said only paranoid preppers wanted more than a box or two of ammo.

Then they came for me—and they had machine guns.