Probably never. I think he should hire someone who checks his E-mails and asks him "Do you really want to send this?".

In any case, I find there is way too much focus on words instead of actions. It's the same in politics and in business. You have people who get nailed for cursing but the standard for company leadership seems to be to use nice words while at the same time stabbing people in the back. I would be more concerned if Linus physically abused people or laid off people with one day's notice "It's just business".