Absolutely. My point is that billions of people make it harder to avoid and some these problems. Mathematically, 10,000 people in one area can be airlifted out

Absolutely. My point is that billions of people make it harder to avoid and some these problems. Mathematically, 10,000 people in one area can be airlifted out of a problem or have supplies brought in. 10,000,000 people are not easily moved or supplied.