Earlier quoted context omitted.
but rules for citizenship are all different and are being made harder and harder because, well, that's what sells today. Also some countries (cough, Germany, cough) have incredibly stupid rules where you have to give up your own citizenship in order to get a new one.
I think it's perfectly normal to expect someone to give up their old citizenship when becoming citizen in a different country. When you become a citizen, that country is responsible for getting you out of international conflicts and arranging passports (which are essentially documents that say "you should let this person in because of the good relationship our two governments have"), and in turn you're expected to tu…
There is nothing "normal" in expecting to renounce to a previous citizenship if you gain another one [1]. As an Italian citizen living in Sweden I obtained the Swedish citizenship (fortunately before the current government makes it way harder) but I'd never give up my Italian one. I "feel" Italian and owe my country a lot and my happily go back at some point, but I also feel like having the Swedish citizenship is useful, and allows me to vote in a country where I have chosen to live for a good chunk of my life.