Earlier quoted context omitted.
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Did we read the same text? I didn't read it as exploding, but just as a teacher teaching the pupils about the rules of kernel and what not to brake. The text was very clear and informational.
I believe the exploding appearance was an intentional writing style. We reading it because a) it's Linus and b) he very clearly communicates his position to the point of being crass. It works and is stated in the opening: "Dammit. I haven't had to shout and curse at people for a while, but this is ABSOLUTELY THE MOST IMPORTANT THING IN THE UNIVERSE WHEN IT COMES TO SOFTWARE DEVELOPMENT"
Makes a clear statement AND expresses a clear tone. Was he teaching? Yes. Did he make his point? Yes. Was he calm? Behind the keyboard maybe. But in the email I'd wager he didn't want to look calm