I voted for Donald Trump for president three times, and would again, but his social media post about Rob Reiner after the recent killing of the leftist Hollywood actor-director was unpresidential and, to say the least, uncharitable. But it was an unforced error that Trump will have the opportunity next week to make amends for.

The president should seize that opportunity, because the Dec. 15 Truth Social post also was stooping to the level of Trump’s left-wing extremist critics in being petty and vindictive.

“A very sad thing happened last night in Hollywood,” Trump wrote. “Rob Reiner, a tortured and struggling, but once very talented, movie director and comedy star, has passed away … reportedly due to the anger he caused others through his massive, unyielding, and incurable affliction with a mind-crippling disease known as TRUMP DERANGEMENT SYNDROME, sometimes referred to as TDS.”

The president continued: “He was known to have driven people CRAZY by his raging obsession of President Donald J. Trump, with his obvious paranoia reaching new heights … .”

Setting aside that non sequitur cause-and-effect assessment of the motive for the killing, Reiner—a self-described “raging liberal”—might not have been the Patient Zero of Trump Derangement Syndrome that besets so many on the Left, but he was certainly a primary vector in its spread.

The following are representative of the innumerable hateful and vitriolic social media posts Reiner—one of whose films, coincidentally, was the 1995 dramedy........

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