Neither Switzerland nor Singapore has a unified culture. People from German speaking Zurich are not the same as french Speaking Geneva or Bern. Likewise for Singapore there is a community of Tamils, Malays, Chinese etc. I grew up in extremely multicultural environment and can assure you that there were no identity issues. These issues popup once class/money imbalance pops up.

At the root of it all is wealth disparity. The rest of it is just a facade.