Bringing guns to shoot people you disagree with, then shooting them and injuring them for doing their job is not a harmless demonstration. It's terrorism, and they deserve what they got.
Only one person brought a gun (singular). The rest didn't shoot anyone, nor was there any evidence that they planned to do so. They were convicted for being at a protest where one asshole brought and shot a gun.
He could have had the book thrown at him. As for the rest, if you seriously think that getting 70 years for being at a protest where one person shot a gun is appropriate, you have a lot in common with a Stalin-era Soviet judge.
He could have had the book thrown at him. As for the rest, if you seriously think that getting 70 years for being at a protest where one person shot a gun is appropriate, you have a lot in common with a Stalin-era Soviet judge.