Do you realize how close to the brink we are?

The reason to convict Trump and bar him from office forever is rather simple: No sitting president has ever incited a violent attack on Congress. Allowing Trump to do so without sanction would invite a future president with autocratic ambitions and greater competence to execute a successful overthrow of the federal government, rather than the soft echo of post-Reconstruction violence the nation endured in early January. The political incentives for the Republican Party in convicting Trump may be unclear, but the stakes for democracy are not. The Senate must make clear that attempted coups, no matter how clumsy or ineffective, are the type of crime that is answered with swift and permanent exile from American political life.

That Trump is responsible for the assault on the Capitol is clear far beyond a reasonable doubt. Trump informed the assembled crowd on January 6 that “if Mike Pence does the right thing, we win the election,” and that “if you don’t fight like hell, you’re not going to have a country anymore.” He then directed the mob at the Capitol, falsely telling the rioters he would accompany them, retreating to the White House instead. Those arrested after the attack have themselves told the authorities they were acting on the president’s admonitions. Behind the scenes, Trump was attempting to orchestrate an autogolpe using the Justice Department to force states to overturn their vote tallies; he was foiled only by the threat of mass resignations. The mob was his last resort.

[...]

Any president from any party who incites a violent attack on another branch of government in order to seize power should be forever barred from holding office.

If Congress cannot uphold that principle, it will not survive the next attack if it comes.

  The Atlantic

...but hey, do what you want...you will anyway.