You are right, but do not take into account of what the Founding Fathers would have thought about a standing army in today's technological environment.
For example, they could never have thought that one missile could destroy ten cities in less than an hour, from 12,000 miles away.
Given that hard fact, their philosophy now would be different than it was then. You have a different threat, therefore you must have a different defense and a different active response to that threat.
It might be, but I don't think it's prudent to be too confident in projecting one's own opinions into dead people's heads. Of course, I'm sure if the founders were alive today, they'd universally hail me as the rightest guy in the world on every subject.