I know of many ignorant people who help others. Many non ignorant people who do not help others. And I know self absorbed people who arent ignorant and ignorant people who are not self absorbed...

I had this argument with a prof once. He gave a lecture on how critical thinking made us better people, even though it was associated with depression and suicide.

I asked him what, then, the point was and he didnt have an answer...

My guess is just that it helps people feel superior. And there is an evolutionary reason for critical thinking that is no longer necessary.