Earlier quoted context omitted.
It's not like there aren't disgruntled employees before layoffs. If a single employee could cause billions of dollars in losses, then the company already has a big problem regardless of layoffs. It's very interesting how so many people in upper management seem to think that they can trust employees not to sabotage and cause billions of dollars in losses by paying them like 100k a year.
The big difference is liability exposure. If a current employee causes damage, that's one thing. But if a recently laid-off employee who retained full system access causes billions in losses, the CEO and board would face severe consequences legally and reputationally, since it would be perceived as an obvious security lapse.
That's no way to run an (overly litigious) society.