Looking around at evidence, only the ones with somewhat cute eyes can qualify for empathy. Bad luck if someone is a grass or an amoeba, but machines will be just fine.

Philosophers may squint at the suffering-in-itself long and hard, but I doubt they'll affect waking/extinguishing empathy of the masses. Exploring the suffering that fails our empathy (e.g. suffering of a wheat plant harvested) seems a highly abstract task; more abstract than high mathematics.