your points are duly noted, but it does fit the pattern if one simply skips the source of derangement and recognizes that the only thing standing between derangement and mass shootings is a quick stop at a Walmart (albeit recognizing these folks had apparently been patronizing Walmart for some time).
The Planned Parenthood shooter was radicalized by some videos (it seems he used phrases suggesting so) and the San Bernardino Islamist shooter was apparently radicalized by ISIS ... and in the US that's all it takes, the physical militarization of oneself is trivial to the process, it being considerably easier than getting a drivers license, and often easier than voting.
But they are two separate issues, and BO does seem to be lumping them which while not accurate, is functionally is some respects the same, unless we are to suppose that radicalization is something that is going to stop, something that I find to be a consequence of new media - and unlikely to stop.
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