Liberals love to try to solve specific problems by taking away everyone's rights.
The other leading indicator of firearms abuse is leftism, which is directly correlated with mass murders going back to the 1980's and before. Patrick Purdy, the infamous schoolyard killer in California who shot a number of school children on a school playground and in a McDonald's, was a lefty-trendy drifter and bum. Jared Loughner, who shot Congresswoman Gabrielle Gifford was similar stuff.
Note: Wikipedia's article attempts to disguise his liberalism and only tangentially records his fulminations at George W. Bush; the ADL vetted his writings for antisemitism but cleared him of same, noting only a "general" dislike of religious belief (but somehow failing to note what others saw, which was his online postings strongly critical of Christianity -- when was the last time you heard about a conservative who was strongly anti-Christian?).
The latest Virginia gunner would appear to fall into this general critique.
And I don't think we've learned the last few nuggets about South Carolina mass murderer Dylann Roof. </off gratuitous commentary>