2/2) Amendment II. They never dreamed that technology would advance to create incredibly deadly weapons designed only for war, and that the Supreme Court would be stupid enough to ignore the "well-regulated militia" language and think that the founders had the original intent for such warfare to break out in our streets, schools, houses of worship, and everywhere else that people congregate.
Yes, our founding fathers were brilliant, but today's utter stupidity has outsmarted them.