Yep, we're both on the same page; your scenario is exactly how it goes down. First proto-human grabs a club to beat back another, and the arms race is off and running. 3 million years later, and here we are.
I may differ from others who (profess) to be concerned. As far as I'm concerned, this arc was set in motion with the big bang. If universes have life spans, then the natural end-point would be recurring development of non-organic life.
If that's the case, then the times we live in today are just a minor stepping stone. Like a multi-stage rocket, perhaps organic life is just a phase in which to pass. We fulfill our role/destiny by building the infrastructure in which non-organic life is realized.
If it's going to happen, then it's going to happen. How can it be stopped? Why should it be stopped? If one reaches that conclusion, then isn't the logical choice to break into the liquor cabinet on the Titanic? I say, party on Garth. Ride the wild tiger. Get involved, stay involved, but realize it's moot at the end of the day.
I would love to break into the Titanic liquor cabinet with you and then go swap ideas on some deck chairs as the band plays but I am in central U.S. so probably not going to happen.