I don't think it's unfortunate at all that he'll be locked up. He's a murdering thug, at least twice over by his own admission.
Perhaps. That's even more an indictment on libertarianism if true, but I'll let the more educated libertarians decide whether that's true or whether DPR is not a True Scotsman.
We're all just bits in a universe of information, really. I'm not inclined to take DPR's words at other than face value just because he wasn't able to actually kill anyone.
For instance, the first hit that he claimed to have achieved for $80k was with an undercover cop, so there is hard evidence on that one.
Guilt is for the legal system to decide, and I'll let it take it's course.
But that doesn't require me to act as if I'm blind or can't understand evidence and reason.