Earlier quoted context omitted.
He's saying that regardless of the hypothesized danger, until there is measurable, non sci-fi proof, it's all just fear mongering. Not that we shouldn't "give a fuck about anything."
You cannot have non sci-fi proof of future events, it will always be unmeasurable theories. So you can choose to wait and see, and maybe it will be too late or to hard to act when you have sufficient proof. Or you can choose to start thinking about it now, and see what we can do to to set up safeguards. And perhaps those safeguards will be useless, perhaps not. That's called prevention.
You can do research and testing without fear mongering.