The period was always the humblest of punctuation marks. Recently, however, it’s started getting angry. I’ve noticed it in my text messages and online chats, where people use the period not simply to conclude a sentence, but to announce “I am not happy about the sentence I just concluded.”
It’s similar to the problem with online reviews — people are far more likely to leave a review if they’re pissed off about something. If they’re happy, they probably recommend it to a friend and just keep on living life.