Linux Desktop Insecurity?

While Linux enthusiasts have touted security as one of the advantages Linux has over Windows, I fear Linux desktops' use of plain password dialogs to acquire system privileages on-demand is a serious vulnerability because:

  1. Password dialogs appear too frequently, creating complacency and training users into typing in the superuser password reflexively.
  2. Password dialogs can be easily emulated.

Are there any Linux features I am not aware of that protects against this?