Also a good point. Some day, newspapers will cry with alarm "People being killed by asteroid strikes on the rise! More people are dying before their 5,000th birthday than ever before. These asteroid strikes every thousand years or so are clearly a new problem were facing. Why is the government dragging their feet on asteroids?" It's a whimsical example but it makes the point. People weren't living long enough to die of long-term diseases. Cancer is on the rise only because we're cured many things that would have killed us less than a century ago.