Well... we don't have a real long track record and past performance isn't indicative of future gains. I agree with you, but we are kind of speeding into the unknown. Which like any adventure is risky.
Hunter gatherers were real stable for a long long time. One person, or even a fairly large group of people couldn't cause much trouble.
We're moving much faster, which again i think is cool, but it's much riskier. An obvious one, there are enough nuclear weapons to wipe out humans in a few hours. I don't think nuclear war is coming any time soon, but we've only been at this 'high tech' stuff (i'm picking agriculture, neolithic revolution) for about 10,000 years. Wealth of nations is around 250 years old - traders are much older of course, but 10k seems like a good upper bound. Can we avoid nuking ourselves for 10k years? I sure hope so.
Anyway, there are existential risks, and other, less dangerous things like world wars that have the potential to be much worse than a guy with a club.
Also, there's not much incentive in the system to not wreck the system. For, example "The big short" is a fun movie. "Too Big To Fail" is a much more in depth look.
I guess, my point is, That strategy is a powerful tool. It's not a pat answer to all the world's woes. It's wise to treat it like any other dangerous piece of equipment. Be aware, be alert. It's ok to take a little more time with power tools to avoid cutting off an arm.