system
Given the following post, respond as if you're commenting on Reddit:
human
[General]Why do Doomsday devices have a "cancel" option?

It can summarized by 'lazy writing' I suppose but I wonder if there is any 'logical reason' behind putting a big red "You know what fuck this, I think I kinda like this planet" button.

Especially Doomsday devices that will destroy EVERYTHING! Why would anyone put a cancel button on a let's say.. satelite that will destroy EVERYTHING on Earth?

I understand the whole countdown thing, probably a "5 minutes until Earth's destruction, enough time to wank while thinking about all the child deaths you will cause" thing.

So basicly, is there any logical reason? Is there any story that said "There is a cancel button because.." ??
gpt
Any person smart enough to build a doomsday weapon is also smart enough to realise there will be extenuating circumstances when they may need to pause or stop it. 

For example: 

1. Negotiations go well

2. the heroes play their trump card, which is what you want

3. chaos ensues and the world destroys itself 

4. your getaway plan fails and you don't intend to die

5. Mittens got in the way of the doomsday machine and is playfully swatting at the targeting laser 

All this question proves is that you are not ready to own a doomsday weapon.