Human race as a self aware and preserving entitiy ?

We can, as humans, clify ourselves as predators with morals. We flex our muscles, show our strength often, at necessary and unnecessary occasions, but everything seems to corrects itself in the end. Society seems as a self aware "thing" that is always rooting out the undesirable elements. In here I am mostly referring to dictators. Not a single one has lived the day that there wasn't someone to oppose him, challenge his rule and overthrow him, be that peacefully or violently. Even the dictators that managed to have things their way in the given moment are brought to their knees. Hitler, Saddam, Milosevic etc. But then again, this natural instinct for violently bringing down something that isn't in the majority's interest seems very well controlled in the recent decades, following ww2. Cooler heads have prevailed in the arms race and in the numerous occasions by which we could destroy ourselves, and it seems that there is a bright future for us.