What do we know about people?

Well, it has been awhile since my last update, but I've been swept up by the winds of life.

So during Leil Shavuos I was learning with someone and we starting talking, eventually digressing into the land of philosophy. Among the topics that came up was this:

Each person is created with a certain predisposition. Some are nice and kind by nature - it's in their genes. For them it's easy to do chesed and to be well liked by people. Others have a different genetic makeup, one that makes it a great challenge to go out of their way for someone else. Call it introvert/extrovert, call it happy/depressed, call it demanding/giving, it doesn't matter - this is all part of one's personality and most probably it is not a learned behavior but one that's dictated by chemicals in the brain. If so, why do we bestow honor on people we see as being righteous? And why do we shame and distance ourselves from those who are usually not acting in the best fashion? For it could easily be that the big baal chesed in the community spends virtually no effort doing all his good deeds - it comes to him naturally. And that suspicious looking guy in shul who always keeps to himself and is unapproachable... maybe for him to do a single act of kindness takes more effort (on some global objective scale) than all the efforts of the aforementioned baal chesed combined, during his entire life! The point is that if the true value of one's actions is to be measured only in terms of how much effort is put into them, then we are utterly clueless about the structure of the merit hierarchy.