I disagree, there are many sinkies who are irrationally patriotic. They just express their patriotism in different ways.
For example you have seen some sinkies volunteer for all kinds of SAF posts. Spending their weekends and free time serving the SAF. Or some sinkies who give up their precious time to volunteer for National Day Parade. Dancing or performance etc.
Many sinkies are "that" patriotic for a country that values them poorly. They are ALL OVER SINKIELAND!