Why is Trump still president?

If I sack someone for being shit at their job I expect them to leave immediately. You don't keep them on for another couple of months so they can take revenge.

So why does America have this limbo period where they keep a president in power despite him losing the election? Surely anyone in that situation apathy would kick in at best or at worse an urge for revenge, you couldn't concentrate on the job with the bitter taste of defeat in your mouth. It's almost cruel.
Why is Trump still president?
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