Why can't people understand!!!

My sister's ticked off at me since I ACCIDENTALLY turned off her computer entirely. But is it any wonder why I accidentally did it?? Since the parents are always insisting I turned off MY Computer when I'm going to bed including the power bar. But when SIS goes to bed she is allowed to turn off the monitor (since the parents "don't want to argue with her". So the once in a blue moon when I do use the upstairs computer. I might not think and turn her computer off entirely. But no one can understand including my parents.