She's angry with you because you embarked on a path that could take away something she values very highly: YOU.
By fighting with you she's trying to apply pressure to stop you getting into that situation again. She hopes that if you are mad enough to face up to a loony with a gun, you will not be mad enough to get into a situation where you could go home and have to have that argument.
In essence, whatever else she feels, you are her comfort zone and you are her point of safety so she is not prepared to lose you over a valueless drug addict who would have left if you had no confronted him. Therefore she fights with you. It's counter-intuitive, but totally logical.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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