Sorry, I can't logically feel the urgency
humanoids have survived for millions of years. Yes, we should do an asteroid/comet search and ultimately have the capability of a "shield." But we don't need to urgently spend a lot of money on artificial goals. New technology is going to naturally solve the detection problem(wide field optic improvements). Fund it enough so that we continue to make progress and it will sort itself out. If the difference of a few years costs us an undetected asteroid hit, then the cosmic joke is on us, and maybe I'll believe in a God with a dark sense of humor.
It would almost be fun (if not so serious) to find a huge rock heading at us. Talk about events that would FOCUS our efforts!