I will not apologize for suspecting those who advocate violence might be guilty of violence

[MH1]

82. Speculation doesn't require anything, as long as it is acknowledged as speculation.

I don't understand what the big deal is. There are domestic terrorists operating in this country. There have been domestic terrorist attacks before. Likewise, there have been foreign terrorist attacks here. It could be either. Or it could be, as the OP indicated, some whackjob who in their twisted sickness just thought it would be fun. In this case there is a lot of potential symbolism that suggests violent right wing extremists. Then again, as you say, wouldn't they be more likely to target government property? But wait, this happened in Boston - the most high profile event of the most high profile city in the state that is probably most hated by right wing nutjobs.

All that said, I think the fact that no one has taken credit for the bombing makes it less likely to be an organized group, and more likely it was either a lone wolf with political intent, or just the sick whackjob.

JMHO, and very much just speculation. I don't think speculation causes harm, as long as we are clear we are talking about violent extremists of whatever persuasion, not the guy down the street who happens to be a known (gasp!) Republican.