id like to know how they came up with the idea in the first place.. i mean.. wtf were they thinking about?

using a potentially dangerous technology for their copyright issues... a technology that can be simply exploited by adding the $sys$ prefix to a filename. and yes we have seen the sony's rootkit being used by malwares. there has been 3 cases that i am aware of.

and that very technology became an issue for the World of Warcraft game. WoW has an additional application called Warden, which checks for any users using cheats. Players have reportedly used sony's rootkit to hide their cheat files. Therefore, the developers of Warden had a very serious issue in their hands.

using a rootkit is a very poor choice, its obvious that they never thought of the consequences of using such technology beforehand, or maybe they did but never cared.

and using average user's ignorance about rootkit as an excuse is totally immoral and unethical. it just shows how much they care about their customers.