Yet there are boundaries on which weapons we can and cannot develop: Nuclear, Chemical, Biological etc.
There is at this moment little evidence that autonomous weapons will cause more collateral damage than artillery shells and regular air strikes. The military usefulness on other other hand seems to be very high and increasing.
Like skydiving without a parachute, I think we should accept it is a bad idea without needing a double blind study
we have, of course, developed all three. they have gone a long way towards keeping us safe over the past century.