AIs or SIs may well have optimization functions that don't permit them past the "Destroy all humans" phase into the "Harvest resources of nearby starsystems to

AIs or SIs may well have optimization functions that don't permit them past the "Destroy all humans" phase into the "Harvest resources of nearby starsystems to make more paperclips" phase - They may well reach a local maxima, be unable to proceed, and burn out long before then. I would assume that most AI with a sufficiently bad optimization function as to destroy their creators would fall into that hole.