"Don't forget James Buchanan single-handedly started the Civil War!"
And Trump single-handedly stormed the Capitol?
Don't get me wrong. Trump is certainly the leading contender for the worst president position, but it's not a slam dunk certainty, and it is a question that would be better answered a couple decades from now.
He absolutely single-handedly incited tbe storming, by a cult of personality dedicated to him personally.
Any othef presidential contenders from 1856 beats Buchanan, the Civil War still almost certainly occurs. Trump isn't elected in 2016. what happened Wednesday almost certainly doesn't occur.
What happened on Wednesday is a snowball fight compared to the Civil War.
Of course the Trumputsch isn't equivalent to the entire Civil War. But it echoes much of what led up to it, from the Brooks–Sumner Affair, to a raid by the Border Ruffians, and various seizures of federal facilities by Southern governments.