And the Hawaii incident was over an official alert system which hit far more than cell phones: https://en.m.wikipedia.org/wiki/2018_Hawaii_false_missile_al...

This Twitter incident is a complete joke in comparison. While you should certainly be judicious if you're in any sort of significant communications role, I really don't care what's on USSTRATCOM's Twitter. I didn't even know they had a Twitter nor would I consider the information there more than a frequently updated newsletter. Give the employee a break, it's really not that big of a deal.