I agree that often people do not intuitively find it horrible scary to let an AI join their group aka let the AI out of the box, but on the other hand intuitively are wary of letting intelligent people* join their group for the reasons you listed above. In general people should be wary of both and more so for the AI since it does not share a common genetic history, brain structure, biological needs, and therefore and in general is a greater unknown. This lack of intuitive fear is much like how many species of animal lacked any fear of humans on first encounter like dodos.

Guns, germs, and steel: the fates of human societies By Jared M. Diamond

Just as modern humans walked up to unafraid dodos and island seals and killed them, prehistoric humans presumably walked up to unafraid moas and giant lemurs and killed them too.

Lack of intuitive fear can cause instinction.

*Where intelligent people are the people more intelligent then the group by a good degree but not intelligent enough to bridge the inferential divide.