Terrorism (by Muslims) doesn't increase around Ramadan. Ramadan is the worst time for extremists to do anything. Ramadan for Muslims is a time of spirituality, being with family, and discipline. While that may not be across the board, being thirsty and hungry makes all activity more difficult, and that applies to all - especially during the 17+ hour fasts while Ramadan is in the summer.
Makes me sad about what happened to the author, but Ramadan has very little (if anything) to do with it.