I worked for a few months recently as a remote support agent for a big ISP, and many of my customer's browsers looked almost as bad as screenshot you posted. As I was cleaning up, I would ask them for each toolbar (because I was required to) "do you want me to remove this?" They would invariably reply "I don't know what it is or how it got there." I think this pretty much kills the "informed choice" rationalization. About the only toolbar they understood or wanted was Google, and maybe the one that came as part of the isp's setup package (because they were used to it).