Well, no, Singapore's rules on caning were inherited wholesale from its British colonial days.

"Decades of multicultural violence" is also absurd. There were indeed race riots in the 1960s, but these were closely tied to the ongoing saga of the formation of Malaysia and subsequent expulsion of Singapore, and as much political as racial (to the degree that these can be separated, since many key players like Malaysia's UMNO openly advocated for a given race).