Well put.

I think a lot of your political beliefs start with your parents and people around you, but then are shaped by what happens to you. If you get hit with the hard reality of life in some way (debt, health, etc) it tends to push you to be more progressive/empathetic toward others because you see just how truly cold and cruel the bottom of our society gets treated. If you have coasted through life and have parents and friends supporting you financially and we're lucky enough to get a good job and have relatively good health and such then you may not know the horrors of what can happen if you hit a few rough patches.

Similarly in military service, if you get injured and now have to go to the VA and fight to receive the most basic of medical care you were promised and denied it tends to push you left/progressive because you want things to be better. If you are still in the service or left it relatively undamaged then you could easily still see things from a conservative and right leaning perspective.

When you or people close to you get (denied medical care, denied housing, denied work, pushed into poverty and/or homelessness, used by the system and then discarded like trash) you tend to see things more progressive and want to provide some basic levels of support and humanity and empathy toward others as opposed to exploiting them for profit.