Immaturity can have lots of meanings. The raw stupidity of what is almost certainly the great majority of the human race is one.
Granted, this is an arguable point, but the wonderful advice of Jesus Christ that we should judge them by their fruits, certainly seems to be proof positive that our species is sunk in Duhville up to its self pitying neck.
Look at the world. Very little sanity, compassion, and creative intelligence out there, wouldn't you say?
Are there exceptions? Certainly, and Godspeed to them. Glorious art, the manifested, detached intelligence of science, and healing kindnesses. Yes, lots of exceptions, but these are the exceptions that prove the rule, because what is MOSTLY out there are people who just haven't got it that unless you s-t-r-e-c-h your courage and intelligence to explore at the "big picture" of life (and the bigger the better), you will be an enabler of evil (like the enabling wife or husband who refuses to acknowledge that his or her spouse is an abusive drunk).
Well, you know what; our country has an abusive drunk for President. But how many people are willing to de-hypnotize themselves long enough from their 65 IQ sitcoms to passionately acknowledge that fact? Abusive drunk, the 21st Century anti-Christ, the seller of America's soul to resurrected neo-Nazis, a genocidal mass murderer of Muslims -- take your pick. The point is this man is filth incarnate and should be cleaning our commodes, but NEVER be the President of the United States of America.
Yes, but he IS the President, isn't he? Conclusion? He's a symptom of an immature species.
If our species AS A SPECIES rose to the ultimate challenges of life (or at least gave it our best shot), the "human condition" would be 100% different. Evil would be an anachronistic sickness that was transcended by the great majority of the human race, and in time would be totally "selected out" by evolution.
Intelligence "transcends" evil. It's limitlessly vaster, more mysterious, and incomparably more satisfying than evil. The same thing is true for courage. "Cowardice" (e.g., Nancy Pelosi) is it's own punishment. It may buy you a few moments of feeling "one up", but cowards in the race of life are even slower than the tortoise, while the jack rabbit of science, artistic creativity, and real world compassion grow wings of eagles and fly into the emporium.