to which I'd reply "Possibly, but that feels really stupid."

If people choose to not have fun because fun feels "really stupid", then I'd say these are the problems of super-stupidities, not superintelligences.

I'm sure there will exist future technologies that will make some people become self-destructive, but we already knew that since the invention of alcohol and opium and heroin.

What I object to is you treating these particular failed modes of thinking as if they are inevitable.