Since I was a detective myself for a short time in my youth, I know the meaning. Often, the first and obvious suspicion is false. You ask yourself "cui bono", and another suspect, who you did not think about, appears.

For two weeks now, this question has been troubling my mind. It does not leave me.

In Syria, a terrible war crime has been committed. The civilian population in a rebel-held town called Idlib was hit with poison gas. Dozens of civilians, including children, died a miserable death.

Who could do such a thing? The answer was obvious: that terrible dictator, Bashar al-Assad. Who else?