The AI we have today is not capable of the kind of malice that people seem to be afraid of with all of these FUD stories, and will not be any time soon if ever. Even if we add some AI to things like drones which can kill people it is only the malice/incompetence of the developer that causes the destruction that results. If an engineer built a bridge woefully inadequately, either on purpose or because he is incompetent, and it falls down and kills a bunch of people would you blame the bridge or the engineer? We are not even remotely close to the Terminator level strong AI, and it's still a big open question whether such a thing is even possible at all.
By your own admission, AI *might* eventually be capable of the kind of "malice that people seem to be afraid of". And that malicious developers can cause destruction even sooner.
And the laws of physics clearly predict that strong AI is possible. or do you consider intelligence to be some kind of supernatural quality?
Also it is the experts in AI who are predicting that AI will be possible and achieved in a matter of decades. Why would you even come out and pretend that it isn't?
are you saying that people have no right to worry about problems that aren't likely to happen for 20 years? is that the cut off date?