There are those....

who are convinced that they are "Oh so important and indispensable to the company/business/municipality/country".

Well then let them fill up a bucket with water, dip their hand in it and shake the water as much and as long as they want.

When tired, let them remove their hand and watch the water....

The time that it will take for the water to be calm is at best the time that it will take for them to be missed...

That should bring them back to earth!

No one is indispensable.