Because time and time again, disgruntled and often soon-to-be or recently-former employees sabotage or steal from their employers. It's an IT security best prac

Because time and time again, disgruntled and often soon-to-be or recently-former employees sabotage or steal from their employers. It's an IT security best practice to disable logins immediately when someone is notified or gives notice of termination. Often during the first HR sit-down. It's cold, but at least remaining employees aren't put at risk.