Densely populated cities filled with mostly educated people are perfectly capable of riots driven by ethnic tensions and dubious claims, but Singapore's last race riot was in 1969[1]. Singapore had legitimate concerns about racial tensions in the 1970s and some of its more illiberal policies were arguably practical responses to those situations, but that was a long time ago when Singaporean society was very different, and this draft policy's clauses about making it illegal to publish material that "might diminish public confidence in a state body" seems to have other priorities.

[1]There was another riot involving Indian construction workers in 2013, but that was a spontaneous [massive over]reaction to a bus driver running someone over, not something planned or stirred up beforehand. And that's every riot in Singapore since 1969...