Segregating gifted children in with the regular population
Do you mean desegredating, that is, keeping them in? If so, I agree, it may be bordering on abuse. I have only anecdotal evidence to support it, but I suspect there may have been studies.
No, it is not sufficient to make a policy decision, for instance. But if I have to go and vote on this issue, it is at least something I could base my judgment on.