It seems to be about both. You can find plenty of comments from gun advocates in this thread claiming that these protestors deserve what they get because they're probably anti-gun anyway.
Yeah but you don't know if the posters aren't just trolling, and even if legit gun advocates you can't really expect them to come out and say this is what I always feared and never realized I was just talking shit about what I would do if this happened and surprised to learn I am just a coward that is scared of the government.