Humans evolve as they mature, grow and have varied experiences. Most of us are not the same people at 30 that we were at 15, and are not the same at 50 that we were at 30. Experiences change our perceptions and beliefs, both political and ideological. At any given time in our lives, we are the sum of what we have experienced up until that point. Most people, in my opinion, continue to evolve throughout their lives.