Good, this idea that all weapons are evil is an insane luxury belief.
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The problem with building AI weapons is that eventually it will be in the hands of people who are morally bankrupt and therefore will use them to do evil.
When China attacks with AI weapons do you expect the free world to fight back armed with moral superiority? No. We need even more lethal AI weapons.
Mutual assured destruction has worked so far for nukes.
My point though is that this is the only use case for such systems. The common comparisons to things like knives are invalid for this reason.