While the author is almost certainly on the right track, it's important to bear in mind that psychopaths, while sharing some essential qualities (or the lack thereof), appear to come in all shapes and sizes and that most of them don't resort to outright violence to get what they want.
There's going to be a lot of finger-pointing and hand-wringing in the coming days as we begin to process the awful tragedy that unfolded early this morning in Aurora, Colorado. In particular, it seems that right-wingers are eager to point fingers and are being hypersensitive about any suggestion of right-wing politics being even remotely involved in this case.
Of course, one of the foremost facets of events like these is that premature speculation is almost always wrong. It's wisest to let the facts emerge first, at which time we can begin making a rational appraisal of the event and its underlying causes. (We will, of course, be keeping a close eye on just what is in those "items of interest" found in the home of the suspect, James Eagan Holmes, since that will tell us a great deal.)
Unlike a lot of the talking heads out there, though, it seems silly to run and hide from the political dimensions of these kinds of tragedies, especially when it comes some of the broader social ramifications, most notably the role of the mass proliferation of handguns in American society that's occurred in recent years. Just ask folks in Seattle if that conversation isn't already under way here.
Comment: 'Sustainability', as it is used by the CO2-obsessed green movement, is a highly politicised term referring to 'targets' that might be reached if computer models tell them exactly what they want to hear - garbage in, garbage out. There is nothing 'sustainable' about a city like London. The only sustainable thing about 'sustainability' is that it is a cash cow.