The decrease of direct human interaction over the years enabled by an anonymous internet sure isn't helping either.
People will say things on-line or in email that they'd NEVER say directly to someone's face because they know there are few/no consequences for online behavior.
I tend to watch my language on e-mails, but I also tend to be very specific in my language. I consider I highly critical e-mail to be a business document and correspondence that could be used in court. Against me if I use profanity and threats, for me if I keep it businesslike but firm. Typically it is
Fact
Fact
Fact
What is being done to resolve this?
Why has this not been resolved?
When will this be resolved?
Will this need to be escalated to the next level (as in legal action)?
Etc.
Yet in some places this kind of format is considered violent and threatening.