I was "fortunate" to live through the dot com crash early in my career.
When the times were good, the messaging was we were all one big family. When the crash came, there were weekly layoffs. Co-workers that thought they were friends turned on each other to keep their jobs.
I learned to keep a fat emergency fund. I learned to work as a mercenary. I get in, I get out, I get paid. Then I live my life, which is not work. I keep no personal effects, and can be out the door in a second. Coworkers are acquaintances, not friends.