You talk of being tested. Who is the tester?
Rewards and punishments are part of the living realm. Consciousness presupposes life.
Saying that altruism is good and psychopathy is bad is judgemental, which is ego.
Extremes are usually unsavory. A little bit of salt on your potato improves the flavor. A cupful of salt makes it inedible.
No sane person would choose ants over a child, but an ant would.
I'm a traveler, not a tourist. I once fed a couple of starving children in Ecuador. It was frightening to watch them eat. They were far too hungry to be grateful, they ate like starving dogs. Likewise, I didn't get any sense of self-satisfaction from the experience. I did it because it seemed the right thing to do. In many ways it was terrifying, perhaps a glimpse of the future.
The guy who owned the restaurant I was in severely admonished me for feeding street urchins. Later in downtown Lima, Peru I got a feeling for what he meant. I gave a coin to a beggar boy. Within seconds I was buried in children with their hands out. I gave up all the coins I had. That only made things worse. Older boys soon joined the group. They started tugging on my clothes and eventually I had to catch a taxi because there were now enough of them to take from me whatever they wanted. It wasn't friendly. It was desperate.
There aren't enough Mother Theresas in the world. If you truly believe what you say about serving mankind, I urge you to dedicate your life to doing just that. The need is certainly bottomless and whoever you refer to as the judge would surely be pleased.
There is no judge, it's all just data.