Why don't kidnapped victims pretend to be psycho like him (role-play)?

Whenever I hear about kidnapping cases, I've always wondered about this. The victims end up screaming, pleading but don't do this:

I imagine role-playing and pretending to be a psycho, let him believe I like kidnapping him together we can keep this a quiet, tell him a fictious story of how I liked killing animals as a kid, let him think I'm just as crazy too, basically try seducing him. Then when he's all distracted, I would already have a weapon to attack him and leave.

Why haven't any kidnapped victims thought of that before? That would one day of getting out, pretending to be like him and like it but it's to injure him badly in self-defense.

Why don't kidnapped victims pretend to be psycho like him (role-play)?
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