Always log out, people
It will be a very irresponsible kind of behavior if you forget to log out from your device. No, you can’t forget to log out in such a risky environment. You don’t know who is waiting there for such an opportunity to complete his revenge. You may have some unknown enemies or an envious colleague of yours who is jealous of your promotion.
Working with coworkers who are always in the search of an opportunity to mortify their colleagues is your damn bad luck. It is hence very unsafe to forget to log out.