These sentences being passed down for those convicted of the Capitol "riot" are what I expect to see from Russia and China when dealing with political opponents.

"Seditious conspiracy" is what they're being convicted of, which is conspiring to overthrow the government. Revolution is illegal.

USA wouldn't exist as an independent country if it wasn't for the founding fathers committing this exact "crime".

If they were being charged with election tampering or something like that, different story. But revolution? This should be protected under the constitution, given it's this very concept that gave birth to the country.