Except that it's not a break with the Constitution at all...it's what it the Constitution says. I know you're not an English professor, Latrin, but even you can't argue any other interpretation of that sentence..."the people" is quite clearly the "militia".
See, back then, people were more afraid of their government than they were of their fellow citizens.
Ever notice how almost the entire document is about what things the government can't do to it's people? "...shall make no law..." "...shall not be infringed..." "No soldier shall..." "...shall not be violated, and no warrants shall issue..."
They had a damn good reason, and we're idiots for trying to undermine it in some ignorant attempt to protect us from ourselves.