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.
Another analogy: a zoo is responsible for protecting the public, and should be reponsible if an animal escapes and hurt someone. But a zoo employee wouldn’t have the same kind of responsibility for that incident as if they attacked someone themselves.
If someone died, there’s a difference between manslaughter and murder.
Nowadays, it’s common for bad things to happen due to systemic problems. It sucks but that’s the modern condition. When that happens, the answer is to fix the system and scapegoating employees is a rather indirect way of doing that.