Many are not required, but do it anyway of course. Either because they're shitting their pants (irrationally believing that these people are both willing to co

Many are not required, but do it anyway of course. Either because they're shitting their pants (irrationally believing that these people are both willing to commit, and capable of committing great acts of sabotage on their way out). Or they rationally understand that their internal security measures are a total shitshow (and so the potential for sabotage is real), or that some of these people are rigthfully disgruntled (hence, the motive for sabotage is real). Or (as I suspect) because it helps them emotionally distance themselves from the people whose lives will be (at the very least) dinged by being on the receiving end of these events. "Why did we let you find out about the layoff by having your account locked? Because we knew you were unstable and vindictive, and basically a walking liability to the company all along."