This is done because when employees are let go they could become potentially hostile to the company. That's why they don't inform people beforehand of the firin

This is done because when employees are let go they could become potentially hostile to the company. That's why they don't inform people beforehand of the firing. What should absolutely be done is inform him of the exact performance problem and steps to improve. An actual well intended PIP and not just a way to throw someone out.