We don’t have the combination of bats and exotic animals in proximity to livestock with animals selected and slaughtered on the spot with blood and guts pouring out into the street. This is why the past few novel viruses have emerged from those conditions. Although you are right in that more care needs to be taken everywhere with more attention paid to natural organic food. For instance mad cow disease emerged a couple of decades ago when people began feeding livestock brain meal from other animals, which is totally against nature. And the bubonic and other plagues that swept through the middle ages supposedly spread in rat infested areas