We see that when a country is converted from kingdom to a republic, in most of the cases, monarchs are exiled even though they could not do any harm to the republic.

For example, Mehmed VI of Turkey, Farouk I of Egypt and Umberto II of Italy were exiled when the whole situation was under control. They didn't even do any crime.

Then, why were they deported?

Another major question is, why didn't these countries adopt constitutional monarchy so that the monarchs can be granted an honored life?