the policy seems to be targeting the muslim. govt dun want their population to grow too big. if the chinese and indians having the same problem, that just too bad. many local muslim has foreigner wife, many a times, husband divorce or dead, the foreigner spouse cannot extend their DP and balek kampong, mostly bring their spore born children back to their hometown.
as much as spore govt kpkb abt no dual citizenship but even they know many spore muslim women marry msian apply for mykard in msia but still retaining their pink passport. of course these ppl are BN vote bank as BN can throw them across the causeway if they vote the other way. in a way, these help to reduce their number, so pap also close one eye when these mykard holders come south to renew passport.