Re: @Timmy B -- A gun is involved in every single mass shooting.
So? Antonin Scalia and all his "originalist" ilk spout that the Constitution should be interpreted by what was originally written. And then went on to do the exact opposite. Rank hypocrisy aside, the "well regulated militia" part is in the original text....
One problem with historical documents and their interpretation is that figures of speech and word meanings shift significantly over time, and may, for example, reverse their meaning compared to how we would understand a passage.
This is a nasty trap that catches a lot of laymen and amateur historians with an insufficent understanding of the usages of the period being studied.
The fact that the meanng is clear to you does not mean that you actually understand it.