Comment by dotancohen

  > demilitarize EU member states so that they can't start a war with one
  > another as they no longer have a military to directly control.

And how would those demilitarized states defend against coups d'état? If your answer is the police then I ask how does the police decide which side to take? And do you really want police armed sufficiently for that purpose? And trained? At that point, you've got an Army with full police-level access to citizen records, investigation capability, and internment options.