Rationality, Perfectability, and Mutuability

I very much agree that anyone is capable of discovering the truth through logical analysis in rationality. We are very much taught rationality in college and in a more basic sense in life. College is very much a social institution that pushes rationality as a way of critical thinking and making the right decisions. This is easy to agree with.
I very much do not agree with perfectability. I am under the impression that people are born inherently innocent given they hadn't done anything wrong. I don't think people can be held as sinful until they are actually mature and coherent enough to know the repercussions of their actions. The only institution I can believe that uses this premise is the Puritans or Quakers.
I agree somewhat with the mutuability premise that people are shaped from their environment and surroundings. This is a good explanation to a certain extent. Eventually people have to make there own rational decisions that go outside the environmnet their exposed to. The social institution this can be applied to is any educational environment one is exposed to at a young age. This is a part where environment and the people around you play an important role in your life.