Why wouldn't Singapore not choose better economic conditions for itself over a perceived security threat from China that will never materialize unless your country decides in some retarded reason that Chinese immigrants are no longer welcome in Singapore which would he hillarious if not outright stupid not to mention an insult to many Singaporeans of Chinese descent who carved out their own destiny in an infested mosquito island so it can safe haven for the mostly Chinese ethnic Malaysians who now call themselves as Singaporeans.
I think you got it wrong.
Singapore needed US protection since our independence not because of threats from our kinsmen from China, but from those surrounding us.
Not realistic for tiny Singapore island, only 50 km wide, to survive a war with our hostile neighbors on its own.
Threats from Indonesia
Konfrontasi (or Confrontation, 1963–1966) was a conflict started by Indonesia under the leadership of President Sukarno, who opposed the formation of the Federation of Malaysia consisting of Singapore, Malaya, Sarawak and North Borneo (Sabah).
Supporters of Indonesian preacher threatened an attack on Singapore:
Shanmugam | THE BIG STORY
Threats from Malaysia
Ex-PM Mahathir says Malaysia should claim Singapore and Riau Islands
June 19, 2022
" Malaysia has threatened to cut off the water supply prematurely to pressure Singapore politically, a move that has sparked tensions between the two states.
"
(Instigated by Malaysia to cause instability in Singapore)
..