"Are you serious" You bet. 74 convicted of the 740+ arrested  

Al Capone went to jail for taxes. Prosecuters often prosecute and convict for lesser charges.

Here's a puzzler for you: How many Americans have been convicted of insurrection?

As to whether there was insurrection, that's a semantic point- what would you call a violent attack on the US Capitol and Congress with the intent of stopping the election process? I'd call it an insurrection whatever the prosecutor chooses to charge them with.

Now we know what Trumpists will do to keep Trump in power. Anything.