I'm pretty sure my cats may not even wait until I'm dead.

but we rightly don't think eating them is justified

That really depends on the society in question. Go look up "kuru" also known as "laughing sickness". There's tribes that historically ate parts of their dead relatives.

That being said, for health reasons it's a bad idea due to the spread of prion diseases. But the tribe didn't know about that hence why it's wasn't taboo.

And acceptable cultural practices around death vary wildly across cultures. Catholics used to think (and some still do) that cremation is an abomination. But for many cultures cremation is more the norm. Historically (though less so now) there were cultures that practiced sky burials, even though most people would find that horrifying.

Even though humans are the only animal that could meaningfully consent to being eaten. It's an interesting (if uncomfortable) moral quandary.

no, it's just that calling a pig a friendly animal probably isn't the best example to use for this argument