"Give me laughter and I'll become the death of many, give me hell and I'll be your protector". What Am I?

Answer: The letter 'S'

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"I am no sooner spoken, than broken. What am I?"
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A flash of light on a grey day. If you're made of metal, you best stay away. What am I?
A hole in a pole. Though I fill a hole in white, I’m used more b the day and less by the night. What am I?
A house with two occupants, sometimes one, rarely three. Break the walls, eat the borders, then throw away me. What am I?
A king in red with a sole command. If you obey, it will cause you to break. What am I?
A large oasis in the desert. Come with cash and leave with none. What am I?