I will make it easy for you.
Davis could have been convicted, and could have been hung. They decided not to go forward with a trial, in keeping with the widespread mercy the US bestowed on those deluded or oppressed by the slave power. Davis accepted that mercy.
John Brown should not have been hung for treason against Virginia, as JB had never taken an oath of loyalty to Virginia, nor was the Harpers Ferry arsenal a Virginia installation. He could have been tried for the felonious murders in Virginia, but trying a white man for the murder of a black man wasn’t the example the slave power wanted.
By contrast, Davis had taken such an oath of loyalty to the US, and then made war against the US as a general of the militia of Mississippi and as president.
As every American retains the right of rebellion, the federal government retains the right to punish for rebellion. The government also retains the right to not punish at its discretion. The government exercised its discretion.
So a simple question for you: yes or no, do you support treason?
You are a coward LOL!