It does not matter if their risk estimates are wrong although you are certainly not qualified to judge that. They have agreed the risk is worth minimizing and have proposed cost effective ways of doing it. Even your inflated estimates of risk suggest far longer intervals between impacts than any of those searches would take. What actual researchers on the topic say can be found here MIT Reassess Asteroid Hazards. Off course I'm sure you don't trust these guy's opinions, they're only the group responsible for 70% of the NEA detections.

I'm so hurt that you responded so much more nicely to Buster who is obviously out to get your goat than to me. boo hoo. ;-)

Regards,
Mark