Capital punishment always sounds like a good idea, until you realize who gets to wield it.
Imagine if the folks who drove the January 6th scam get to decide who to hang. Capital punishment expansion would only make it significantly easier for the globalists. You don't need the government to solve your problems. When this dude makes bail, he will sit at his house for the next year waiting for a trial.
Oh, and by the way, this is probably similar to the ages your great grand parents were when they got married, and their parents going back a few hundred thousand years. Sure, if that was my daughter, I'd cook him alive, but a 16 year old has only been illegal in America for about 75 years most places, and in probably 90% of the rest of the planet, 16 is the age of consent, including England.