One explosion - unlucky
Two explosions - suspicious
Three explosions - well, what do you think....?
I don't think it is Merkel and the police that needs to answer questions. How do we solve this in Europe. We have bombs going off in many countries in Europe. Trucks hitting peaceful people going about their business.
How do we solve this without turning our entire continent into a police state? That is the question. Pointing our fingers at our politicians isn't likely to fix this.
At a minimum we need to come together, to show collectively that we will not be cowed. Britain is a stellar example of that spirit during the Blitz. Somehow we need to find those values.