Why was the site blocked?

After clicking on the 'why was the site blocked' link, I found that the diagnostic page helped me with understanding why the site was blocked.

As I had assumed, the website had been attacked by corrupted software. If this was a blog site or chat room, or forum, its very easy for bad software to be used to destroy the site. Containing the virus, or corrupted material introduced to this site is expected, but I had wondered why the site had not been taken down completely. Google labeled the site as 'suspicious' which means that it may or may not have bad software (?).

I was slightly intimidated with playing with the site because I had a scare with a Trojan a few years ago, so assessing the corrupted site from afar was my method of approaching the subject!