Ok, back to the topic.
1. Morale. After the Japs enter Singapore, morale of the Brit should be really low. Will the soldiers still raise arms to fight?
2. Pushing back Jap to Malaya could only means that the Jap got more chances to regroup and prepare for another round of assault.
3. Even if the Japs are successful push back, Singapore will be under siege in some sense. How can we outlast our enemy.
Guess that pretty much make people give up that fighting will and spirit.