Everyone writing off AI-related risk in this thread should think about what would need to happen for them to consider AI a serious existential risk. It can be outlandish and unlikely (close call with a bioweapon? unsupervised persistence in a data center?) but people should honestly call their shots and then stick with them.
No. The person making the improbable argument is required to provide an affirmative case for that argument. It's not my job to make the argument for them. For what it's worth, I have done your suggested exercise, and I find every causal link (including the ones brought up by luminaries like Amodei) to be outrageous and poorly argued. But it's not my job expend effort to make their outrageous arguments better.
If we have a bioweapon close call, would you consider AI an existential risk at that point? If not, how close would we need to get?
You don't need to answer here, or disclose anything publicly - just think and remember.