Malays are themselves a foreign race to Singapore and Malaysia. With respect to Singapore voting themselves out of Malaya, I repeat that you should go and do some required reading.
it's not my pov but the Malays treated themselves as natives of the Malaya peninsula. Malaysia and Singapore leaders were presumably happy for SG to cede away from the Federation. i repeat again. that is not much different from Malaysia rejecting SG aka kicking SG out of the Federation.