I have no sympathy for this guy, and those that do... I don't really know what to say about you.
Yeah, I guess he needed help, but he never seeked help... he seemed quite intelligent, too. He had his own views on the world and was happy to announce them in a diary. But I have my own views on the world, and I would be happy to announce them, but I would NEVER consider killing anyone and definitely not myself.
If he did this because he was lonely, well... there are many ways to find love. Before my GF, I know I felt down in the dumps, but he was making it out like sex is EVERYTHING, and that without it life is meaningless.
But this is completely un-true; I have sex regularly, and if someone told me they'd eradicate it forever, I'd be sad of course, but I wouldn't go on a killing spree. And if I was lonely for twenty years, I wouldn't go on a killing spree... I'd never go on a killing spree, actually.
I don't know if this guy needed help, or if he was just a horrible person overall. But there are all sorts of people in the world, and some are bound to be genetically... errr... ahem... mental? A waste of life?
Either way, he's gone now, and it's a damn shame he took some lives with him. I guess that's part of the problem of legally allowing guns in your country... the other part of the problem is him being mental, and not psychologically sound.