"I would like to ask a question. what is more important then the very survival of earth that we all live on? Where are our priorities?"
It depends not only on the quantity of the danger, but on the probability. A super-nova or gamma ray burster might go off nearby. What should be done about that? Or the coming Ice Age, Global Warming, the next Plague, the possible invasion by ET? Or the next tsunami?
What's the probability of a civilization destroying impact in this century that measures currently in effect won't take of? One in five million?
In the meantime everybody has to be feed, clothed, sheltered, given medical care and educated. And if they're not, we won't have the resourses to deal with any problem.
One can't devote all resources to all problems all the time. Yours will have to take its turn.