If you cant control/predict something (like asteroid) - there is no point in worrying about it, it is simply outside of the equation.

Afaik there are people watching the space for dangerous objects, so we’re better prepared than dinosaurs anyway :)

If you do worry about such things - again, fear and instincts speaking, not reason.

You can reason and be reasonably worried about things you can at least measure.

For example how long would current downtime take, or what lessons can we learn to fix things in the future etc.