AGW concerns are not altruistic

This isn't a post against AGW theory, but in how the government is responding to threats in general.

We are to believe that, those who demand government action on the alleged AGW threat, are doing so because of their love of their fellow man.

If so, then why not as much concern about things that are not theoretical, but have happened before?  Such as ice ages.  Ice ages have happened over and over again.  Of course, the prevailing theory is the opposite direction, but what if the theories are wrong?

For example, a super volcanic eruption is believed to have caused the Little Ice Age in the fairly recent past.  If such were to repeat, the effect upon the human race could be dire.  That's because there are so many more people on Earth today than when this event occurred.

Another example is an asteroid strike.  A really big one is believed to have wiped out the dinosaurs.  We could be next.

Yet another is a Carrington Event.  A massive solar storm would wreak havoc upon the electric grid.  It has been theorized that such an event may cause meltdowns in nuclear reactors.

None of these possibilities are being provided for, yet there is all this great concern about AGW, and it hasn't been proven.  Certainly, there are those who claim that it has been proven, but what if they are wrong?  If this concern was really altruistic, why not concern about those things that have happened in the past for sure, and are likely to happen again?