I didn't mean the specific humans I eat could fight back. I meant that I wouldn't want to live in a world where humans eat humans because it would be dangerous.

Human flesh could probably give you very nasty infections as well. After all, it is the same flesh as yours.

We can catch diseases by eating other animals, but with human flesh, the contagion would face much lower hurdle to get across.

Assuming human farms, we could likely breed out most contagions like we have been doing with existing farm animals. So that wouldn't be an issue.