There have been movements over the years to build an offensive capability, usually tied to saber rattling by the North Koreans, but in general the Japanese people haven't supported it.
So calls for them to carpet bomb ISIS are misplaced, they can't do it. They are a paper tiger.
I guess you can say the same for anyone else, but it's particularly true when you are a citizen of a country that has no capability to project military force anywhere around the world.
They were attacked. Nothing written there about defensive military actions.