[8draco8]

That's the reason - you resigned. You knew for weeks or maybe months that you will be going away, it was not a surprise to you that it will be your last day at work, if you wanted to sabotage your employer you would to it before informing them about resignation. It's totally different the other way around especially when highly sensitive data is involved (like credit cards) or if you have keys to the kingdom. Some people have instant urge for revenge after firing talk. That's why companies that don't know theirs employees well or don't trust them, are escorting them immediately out of the building "just in case". I agree that it shouldn't be like that but sometimes, if you are not sure how employee will react is better to be save than sorry.