I've seen more than once employees try to argue loudly for their job back, threaten violence, leave bomb threats, stalker exes, etc. all at a single company. Security walking people out is a precaution and based on my experience there a sound one.
What kind of place was this? I have never seen such a thing.
The worst of seen in software specifically was a guy that had some visa requirements for permanent citizenship coming up and probably wasn't dealing with pressure well already, he had a mental breakdown and cat5 was being ripped out of the walls during the meeting.
The second is an older guy in tears because he'd been struggling with long term unemployment due to ageism (I can vouch for his code at least) before that gig.
If you're not in a region and industry with a lot of opportunity it's a much bigger deal and even reasonable people won't necessarily act rationally.