Like Dubai, many of the migrant workers are ineligible for post retirement life in Singapore and so despite any mandatory savings will not represent any kind of burden on the state compared to delivery of health and housing and care costs.
So they are functionally productive and net positive to any scheme about post work funding for the community.
This is being entirely disingenuous and is completely different to what goes on in Dubai.
I have lived there and can rattle off plenty of criticisms about the country but complaining about migrant workers who clamour to work in SG is not one of them.
The vast majority of Singapore migrant workforce are Malaysian citizens who live over the border in JB, you can rent a 2 bed apartment there for $300 a month and eat out in a restaurant for $2 while commuting each day to a developed country and earn those level of wages.
To pretend these people have a rough deal compared to back home is absurd and I'd challenge anyone to actually talk to them first before getting on your high horse. Ask them if they would prefer to work in their home country.