Humans tend to wake up in the morning and go out to fulfill whatever their perceived needs are. Various things (including religion) tend to influence said "needs".
It's a very rare individual who gets up in the morning planning on feeding someone else if their belly is empty. Once a human gets beyond the lower levels of Maslow's hierarchy, the "needs" get downright weird sometimes.
And some really broken humans skip the lower layers and are seriously detrimental to themselves to fulfill odd "needs" before even feeding themselves.
There's no reason to be angry about it. In fact, it's usually someone angry about how others conduct themselves that leads to the atrocities and major battles you're angry about, Henning.
If you're angry about it, you're dragging yourself down to that level in some respects. You either start getting up every day to do something to fix it (which usually speeds the anger process for everyone else 'cause you annoy or scare the crap out of them) or you realize that the unintended consequences mean a never ending treadmill of problems created in the wake of all your "fixes".
Look at law. It's never "finished". One law leads to another and to another ad nauseaum until Governors decide that it's okay to ban sodas larger than 16 oz. in a place once proud of Freedom and personal responsibility. (Cheap shot, but true.)
If there's one thing that's always common in history books it's all the unintended consequences triggered by "leaders" hell bent on "fixing" things. There's also no way to completely disconnect a single human's "needs" from their actions.
Example from recent reading... Today we say "Lincoln freed the slaves."
Lincoln also kept the draft of the Emancipation Proclamation hidden in a desk drawer for two years because he needed votes first. That usually isn't taught in the basic history books.
Lots of similar examples.
Submitted respectfully for consideration... don't be angry. You'll drive yourself crazy and start writing Manifestos.