I’ve said many times before that all governments, power structures and supra-national organizations are a magnet for the last people you would want to lead them: sociopaths. That’s not an opinion, it’s a description of the dynamics of human group psychology. Greece itself before Syriza is a prime example of this.
The smaller the countries, states, regions that politicians are allowed to rule over, the less likely leadership posts are to attract sociopaths. Other considerations count too, remuneration, chances to forge ties with an elite and serve their purposes. Larger entities are certain to attract pathological minds. Exceptions to the rule are far and few between. Also: the more a society manages the field of propaganda, the likelier it is to get -and keep- a sociopath as its leader.