They do (lack moral agency), but you and I don't (at least we think we don't, but that is a different issue to save for elsewhere). So, while the spider may no

They do (lack moral agency), but you and I don't (at least we think we don't, but that is a different issue to save for elsewhere). So, while the spider may not be morally wrong for torturing its prey, I am morally wrong for allowing the spider to torture its prey when I am in a position to stop the spider.