✔ 最佳答案
One of the reasons is that they want to be able to turn on the computer if they need to. Also, the computer blocks the other items in the computer bag, so you remove it so the screener can see the rest of the bags contents.
I agree that it is annoying to have to do it every time, but at least they still let us bring them right? I won't complain too much or they may take that away too.