If only you could. Many years ago I was sys admin for a small company... first thing I did was chuck out all their old hardware, give the staff new machines, install a server for file sharing... and lock it down... the old machines were full of viruses and the owner got sick of the mess... after I did all this work, within a day one machine was down... over night rebuild to fix it, and the next day it was down again.. the problem: just one user who insisted that she must install some apps from the internet to do her job (which seemed to be surfing the internet all day to plan her forthcoming wedding!). Solution: I locked the machines down so hard and logged all activity to see what was going on. Troublesome user then tried to break into the sever to disable the locks... silly woman didn't realize all this was logged. As the owner wouldn't do anything about this, I soon parted company.
Yeah, users, especially those with a little knowledge, they're the worst.