Not his creepy traits per se, but certainly Paolo's ego impeded Arcosanti's development. Typical Founder's Syndrome: a general unwillingness to take on external ideas and relinquish control. When challenged, he would often tell people to get their own mesa and build their own arcology. This was always said with a smile and a laugh, but also, he meant it.

This was a huge problem. If there's any one thing which defines "what a city is", it's that it arises from a multiplicity of visions, not from a singular ideal. And Arcosanti needed multiple visions, because Soleri's vision was certainly incomplete. His understanding of economics, for example, was not just naive, but nonexistent.

Source: I lived at Arcosanti for 5 years in the mid 90s, and knew Paolo well.

Edit: but perhaps you're right, and there's some root psychological defect which manifests as both egotism and sexual abuse.