Runaway AI could cause the extinction of humanity, but The Big Red Button That Turns The Universe Into Pudding would cause the extinction of all life everywhere, including extraterrestrials, so it's obviously the more pressing concern. Why are you wasting time on AI when the Button is so much more important?

No, The Button doesn't currently exist, and all available science says it cannot ever exist. But the chance that all available science is wrong is technically not zero, because quantum, so that means The Button is possible, so unless you want everything to be turned into pudding, you need to start panicking about The Button right now.