Why is bubble gum not allowed in Singapore?

When I was a child, I ate bubble gums. However, the government discovered that many people spat the gums onto the floor. Workers were needed to remove them and they left ugly marks behind. Some people even put bubble gums on the lift buttons and under the seats of MRT trains. It was very unsightly to see bubble gums everywhere! Just try imagining having bubble gums on your skirts, along the corridor of your house... Therefore the government decided to ban the consumption of bubble gums so that Singapore could continue to be a clean and green garden city.