An asteroid MAY be a problem,

without looking, we don't know.

and without having a plan saved for a rainy day, it's basically planning to fail.

no one is looking to travel to an asteroid, this is about coming up with a really good plan and look out for something that might kill millions and harm the earths ecosystems (i'm talking about smaller than planet killers here, which there are many more)

it's also not an exclusive thing.