what's the govt rationale for not allowing it?
TOTAL Sense of INSECURITY of outside challenge to the Political Party's own political future.
TOTAL Lack of Confidence in its ability to hold on to Political Power in an Open System.
TOTAL Lack of Trust of the Citizens that elect them to form the Government.
It is amazing that in the Open Societies of TRULY Democratic Countries, such restrictions do not exist.
Conversely, in closed societies that has strong political control, or in closed societies that jealously guard their own community from being racially, culturally, or economically diluted, Double Citizenship is unacceptable.
It is unfortunate for Singapore to disallow its Citizens from holding dual citizenship, as on the one hand the Government has encouraged Singaporeans to spread our wings and look beyond our shores for economic activities, and on the other hand imposed such a 'Dual Citizenship' restriction on Singaporeans.
Many countries will jealously guard and protect economic activities for the exclusive operation by their own Citizens, with some insisting on majority stake to be in the hands of their local nationals.
It is not uncommon for US Citizens to hold dual citizenship in the USA and some countries in Europe, benefitting from the economic opportunities of both continents.
Israel has some of its citizens holding US Citizenships, and when crisis fall on Israel, many Jews of different citizenships will return to the call of the country.
Such is the innate trust of a country in its Citizens that reflects the maturity of a Government System that has confidence in its own political status and that of the Citizens that they govern.
Ofcourse you all know this discrepency in civilsation and "demucracy and the way of lafe"... is masqueraded by your tall glass buildings, your starbucks, your fellow compatriots with enough food in their stomachs, your precious new water, your cars and ERP machines etc etc... to the extent that Singapore has not been criticised by any Western government or invaded for that matter. But perhaps that has something to do with the fact that Singapore has no oil.