PaulB said:
I have plenty of perspective. I don't mean that we should send armed police around to kill the perpetrators! Although...

There are many different type of 'terrorism' and I'm suggesting that this is just at the other end of the spectrum.
This type of attack is motivated in the way suggested has similarities, i.e. targeting innocent victims, high probability of injury or perhaps death, failure to use political or diplomatic means to resolve it etc. It is possible that tourism in the area will also suffer as a result of this 'attack'.
I just feel that the police should take this very seriously which I am sure, due to the publicity, they will.