In fact the people pressing the play button are the ones telling us it cannot be controlled, it is a threat to human and national security, and warning us of the impending damages they are about to cause. I'd say we've established motive (profit at the cost of safety).
To abuse your metaphor: if the zoo was genetically modifying animals to give them enhanced abilities to escape and kill, and then putting them into an escape room with a reward for escaping / killing, then they would be liable for doing so if the animal went on to kill. Just the same as a trained fighting dog bite is different than an accidental bite from an otherwise peaceful animal (you turned the dog into this monster, now its your fault).
Millions of people seems, uh, much worse than that. The Ukraine war is estimated at 2 million casualties.
At the very least your dog stands a good chance of being put down.