On one side, I agree with most comments here - end to end encryption is the only way to go, don't use snapchat, etc, etc.

On the other side, she did write about committing a school shooting. Its hard to infer comedy from a text chat you have no context on. If you pretend this info did not come from corporate snooping then I have nothing against the FBI investigating this.

I find it fascinating that some people have never themselves or known anyone else who, upon some person causing them serious loss of emotional well-being/time/work/money, joked about harming them in some way while venting to a friend or relative without any intention of doing so.

When someone has seriously harmed you in some fashion, it's pretty normal to fantasize about harming them back in some way (without intent to actually do so) as a coping mechanism.

People joke about a fire drills at work or their neighbour in the apartment building burning the toast and setting off the alarm. We don't equate that to people laughing about dozens of people burning to death (even if that's a possible reality of a fire) because to most of us it's not conceptualized like that.

This is a teacher in the US who would have had to sit through live shooting drills and never believed a live shooting would happen at her school (How much would you need to be paid to work somewhere where you seriously believed you had a 1 in 100 chance of being shot in the next 5 years, it wouldn't be a teachers salary for most of us).