The fact that all life on earth could theoretically be snuffed out without warning doesn't mean there aren't more mundane terrestrial factors that we can control, and should, assuming you're into things like comfort and survival.

Oddly, this reminds me of my mild fear of driving. I can't ignore the fact that at any moment while driving, I or anyone driving near me could apply a few paltry newtons of force in a way that causes massive injury and destruction, changing or ending lives. Every time I get behind the wheel, I have to wonder at how casually I'm about to pilot a huge mass at lethal speeds around hundreds of other people casually doing the same thing. There's nothing I can directly do to affect the mistakes of others, but I accept the risk of freak accident and resolve to do what I can to at least reduce the risk of disaster (drive defensively). Analogously, we all accept the (demonstrably small) risk of annihilation by, e.g., gamma-ray burst, and go about our lives.

> Being in control is an illusion.

It is a very useful illusion though. I take it as a sort of veneer that the brain hoists over our eyes to make day to day life bearable. There is some truth to the saying "Ignorance is a bliss".