Animals, including humans, have sensors for pain (nerve endings), and a series of routines in our brains to process the sensory data and treat it as an unpleasant stimulus. These are not optional systems, but innate ones.

Machines not only lack the required sensor systems and processing routines, they can’t even interpret a stimulus as unpleasant. They can’t feel pain. If you need proof of that, hit a computer with a sledgehammer. I guarantee it won’t complain, or even notice before you damage it beyond functioning.

(They can, of course, make us feel pain. I just spent the last hour trying to get a udev rule to work . . .)