I agree that humans need that feeling of fighting for survival. Many of us find that in stressful jobs and lifestyles. Those could lead to the increasing rate of diagnoses. Cimpanzees in the wild organize attacks on rival clans and they attack and kill each other violently. So, humans and ants aren't the only ones. There are probably more species than we think that do similar things.
In my opinion, the Industrial Revolution was one of the best and the worst epochs in history. It gave us so much, but changed how we live, what we value, and so much more in a negative way. Humans have always been rather self-destructive, but since the IR, they have had more free time to explore it outside of the arena of war.
I find it sad that humans seem only able to learn from our mistakes. The damage is already done or being done before we realize we need change.