Spaceweather and Asteroids

I wouldnt spend alot of time worrying about asteroids. With all the technology we have we can early detect if one is coming towards us, where its going to hit and when its going to hit. And we probably have enough technology now to prevent an asteroid from hitting us. I really have dont think in my lifetime, I will ever see/hear of an asteroid hitting this earth.
TUNGUSKA: I think it might be harder to detect an explosion. In research I found about Tunguska, it said that the meteor was only 30 kilometers away from the earth before it exploded, so that might be harder to detect. If its just falling from orbit and is going to hit the earth, thats one thing, but you dont have a meter or anything on the meteor to actually detect whats going on inside, so it would be harder to tell if something were to explode or not.
Shoemaker Levy-9: This would be much easier to tell whether or not something was going to hit another planet. There's satellites and cameras and all types of things in space that would tell you if something was headed for another planet. But i dont think anything could be done to stop the meteor if it were going to hit.