I understand that aspect but when you treat your work as just a job, you actually live with the mentality that you could get fired tomorrow and that's okay and you're mentally and financially prepared for that.
Also a lot of tech workers earn a higher salary compared to most of other professions, so I'd expect people to put away some buffer for a rainy day.
Being mentally prepared, possibly, and even financially as far as being mentally prepared can go, but then not everyone have be fuelled by FANG perks&benefits.