He's showing a number of psychopathic - and especially sociopathic - red flags in that video. Certainly revealing an entitlement complex, but what he's got between his legs has nothing to do with it. He could have been female and given more or less the same speech. Mental instability doesn't discriminate.
I'm not sure what to think... The video looks overly rehearsed. Especially the false little laughs being given purely for dramatic effect. If it weren't for the news report, I'd have thought it was for an audition tape for a serial killer role or something.
I've got no problem with saying I'm in my thirties and in kind of a similar-ish position as him: Never had a romantic connection, felt horridly depressed about it in my teenage years, blah-blah-blah... Would have never have dreamed about making others suffer for it, though - if anything, I actively avoided confrontations. Now, many years on, I've since come to recognise a lot of my social issues are probably to do with having asperger's syndrome (since realising the symptoms fit, have begun the long-ass process of getting a diagnosis for it), but this guy just seems like he's full-on resentful/spiteful for the heck of it, which is a whole different kettle of fish.
The suffering angle is what I don't understand about these people. Didn't they ask themselves what possible difference hurting/killing others would make to their situations? If it was an impulsive thing, you could say it's brain chemistry and he just snapped, but if he had the time to put his thoughts down on video and upload them, he must have been entertaining this scheme for a while. And in all that time he didn't question himself how it would improve matters?
Then again, he's making a big arrogant deal about how he's "the perfect guy" and all, even though he's literally saying he's going to kill you, so... I'm guessing he probably had a whole host of mental issues, regardless.