I'm concerned, certainly for the victims and their families, but also for what it might mean to the country going forward. I truly hope the culprit is determined to be one of the subset alluded to by the OP, and not, as I fear it will be, by a disgruntled American citizen.
With this happening on tax day, I can't help but believe it will end up being tied to the Tea Party, and if there were ever a movement that's gotten a bad rap in public opinion, they're it.
If this is determined to be the work of a domestic terrorist with some twisted idea that this is how you go about making a patriotic statement, that could spell the end of the Tea Party & set back all libertarian leaning movements perhaps irrevocably.
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