Tap Water

I just wonder, Singapore's water has already been proven drinkable many years ago, so why do most people just rather thrist and dry up but still avoid drinking from the tap? Does boiling water really help in anyway or is it just the taste factor?

My dad came into the kitchen and shouted :" WHY DO WE NOT HAVE WATER TO DRINK IN THE HOUSE?" When there was out of 'COOKED WATER'

Also friends that have to boil their water before drinking in a chalet.

Are people just paranoid about the millions bacteria hovering around in tap water?

That I will never know. To me, one can never be to clean, exposure to little bacteria improves the immunity system.