Don't misquote me
First of all the post you linked to didn't address a single word from my previous comment. try to follow the thread, we are specifically discussing how an EXE in an email will run an installer automatically.
I questioned such an ability as Windows has the UAC pop up when an exe is trying to run an installer or requires system access.
I never said it improves security but the ability for an executable in an email, as was being discussed, to just randomly startup and run it's installer would be questioned by the UAC in WinVista/7, would it not?
Do people ignore it and click okay anyway? you bet. Is that the OS fault? no way.