Earlier quoted context omitted.
The point is whether we should be complacent and dismiss concerns just because we don't know when it will happen. Once someone builds it, stopping it might be very difficult. Here's why: https://youtu.be/4l7Is6vOAOA (less than 9 minutes and very clearly explained). Dismissing even a 10% chance of possible catastrophic risks is not what we practice in any other domains. Would you dismiss a concern over airplanes that…
To quote Bret Victor (from memory): worrying about general AI when climate change is happening is like standing on the train tracks in the station when the train is rushing in, worrying about being hit by lightning. Work is being done on climate change, but at the current rate, we're way off preventing catastrophic effects. I'd say that our current level of effective effort basically amounts to ignoring the problem.
Fighting a passive adversary is a much easier thing than fighting an active one (especially one smarter than you).