The Claw, like every single ride in existance, already has a reliable E-Stop mechanism, that would work fine in an emergency.
The Giant Drop, like every single ride in existance, has a reliable E-Stop mechanism, that would work fine in an emergency.
Cyclone, like every single ride in existance, already has a reliable E-Stop mechanism, that would work fine in an emergency.
The owners, like most theme park owners in existance, are realists, and they know their park isn't going to be free from problems. They don't want to be an unsafe park, which they arn't, because if it was, they would lose money. A lot of money, and in the right cirumstances, their freedom.
Stop underestimating them, your safety is their top priority.