No doubt species extinction CAN be a problem--- but my point was that it is not intrinsically a bad thing, or even if it is intrisically a bad thing, there are times when the negative of species being extinguished is far outweighed by the positive-- the tsete fly being (it seemed to me) an example almost as obvious as rinos.
Wouldn't you both agree the elimination of the tsete fly would be a net benefit to humanity?
Maybe. Then again it might have a vital ecological function we are unaware of.