A world government with a force would be an interesting concept. Corrupt African states has lead to their citizens fleeing to Europe with EU solutions being band-aids like giving Libyan coast guard ships and money to prevent the ships from leaving Libyan waters, the better solution would be to fix corruption and help development in the refugees' home countries, but the EU governments can't do that, can they (giving the governments money would just mean the leaders would be able to afford a new villa and a few more Mercedes Benzes).