We believe that the most powerful AI models may soon pose severe risks, such as expanded access to biological weapons and cyberattacks on critical infrastructure.

This is hilarious reasoning. Also, how would a kill switch work on open source models?

The danger of these models isn't jailbreaking or a Terminator type scenario. The risk is in job cuts, energy and water consumption, overproduction of hardware, faulty information, and other mundane risks. The only thing that this bill actually does is make companies liable for the harms their models cause, and even isn't that strong as it is the cost of doing business. This is effective altruist infighting.