Again you show an ignorance of history. Singapore's defenses were directed
seaward since the British didn't think an attack could be launched
successfully from land.

The guns were mounted there to defend against surprise attacks from surface
raiders. They swung around to fire at the Japanese, but they had little idea of
where the Japanese really were and a lot of shells went into empty jungle.

As for Hawaii there were several errors made in intelligence
interpretation and defense planning. They were more worried about Japanese
spies and saboteurs than about an unprecedented seaborne attack. In case
you didn't know it there really were Japanese spies there.

And in Singapore a British captain serving as an Air Liasion Officer was
passing secrets to the Japanese.