@hcs I must admit that I thought that Germany had dropped this, but apparently not for everybody! “Seit August 2007 lässt Deutschland die doppelte Staatsangehörigkeit gegenüber den EU-Mitgliedsstaaten und der Schweiz zu.” https://www.aso-deutschland.de/themen-details/doppelbuergerrecht-die-schranken-sind-gefallen.html
Back to Jürgen’s post, though: I think it was also motivated by people being unable to pay for the colleges they wanted to get into, or finding the situation so unbearable dropping the original citizenship was ok.