I’m not sure if you are being intentionally obtuse, but the obvious answer is that rather than being locked out in the middle of the night, people would prefer to be told directly by a human (ideally their manager), and given the opportunity to say goodbye to their colleagues.

There’s a reason they don’t don that: what if a rogue employee among the thousands laid off decides to leak PII or trade secrets

That’s a complete straw man. Microsoft, Meta and others managed to pull off safely laying off employees while still treating them respectfully and allowing them to say goodbye.

Guess what: Europe doesn't do instant termination and the roof hasn't collapsed.