Bullshit. These kinds of installers trick people into installing things they would never install by choice. For example there are windows where ticking one checkbox disables installation of a toolbar, but ticking the next one enables a different one. So people read the text on the first one and then tick everything, which results in spyware being installed on their machine. The entire installation process for these kinds of things is like that because NOBODY who knows what they are actually wants to install spyware toolbars on their computer.

Would you consider tricking a person with poor literacy skills into signing a contract that gives them your house a moral thing to do? Why is tricking somebody into giving you full access to their computer any different? Also, much like legal contracts can still trick the literate, these installers can trick even technically proficient users who weren't expecting to suddenly have to engage in a battle of wits with their computer.