Anything that harms the interests of the company should be an example to others.
Begging to stay doesn't necessarily mean repentance.
If you don't repent, this person may further harm the interests of the company. Anyway, there is no future. I can earn as much as I can now.
Just like kickbacks, if you don't kill this mouth, then others will see someone take it and get away with it, so I will take it.
Another possibility is that this person will stay here, quickly accumulate his own resources and take them to another company to compete with you.
Therefore, such people can't make small mistakes and can't make up for big mistakes.
Just like a corrupt criminal, embezzling state funds and begging, the state can't keep such a person, and neither can the company.