This article says they are trying to bring back "dozens" of employees. 3700 were fired. Of those apparently some were fired due to clerical error. What is there to explain?
There is a bunch of mass layoffs happening in other tech companies (and across the economy), are we going to pretend they will all go smoothly?
Actually come to think of it, without this acquisition Twitter would still have been forced to let a bunch of people go anyhow regardless of who happens to be the CEO. Possibly just as many. Probably with less severance... but definitely with nicer emails...
Take a deep breath.