That doesn't prove "people" are shit, just that this particular PERSON is shit.  You can't generalize to all people by the example of a single individual, after all you also are a person and do not display the same behavior of purposely running over baby geese.  I also don't think a majority of people would demonstrate that particular behavior, which is pretty high up on the scale of shitty behaviors but not the absolute worst behavior possible, even with baby geese.  He might have stopped to pick up the baby geese, brought them home and tortured each one indivdually for a slow and painful death for his own amusement.

Like most human qualities, shittiness is distributed on a bell curve, with only a few people at each end who are either super shitty or super saintly, 3σ off the mean or more.  Most people fall inside 1σ of the mean with a mixture of shittiness and saintliness.  In practice, the super saintly are almost as annoying as the super shitty, people in the tolerable range tend to have a few shitty behaviors.

Besides shittiness, other behaviors you have to consider when evaluating people are stupidity, megalomania, greed etc.  After you weigh all these qualities, you can split people into 2 general groups, Good People and Bad People.  There are a decent number of Good People out there, but Bad People are more noticeabole unfortunately.

RE