I voted for McGovern, too! Then I graduated from college, got a job, started paying taxes, and veered very dramatically to the right.
Which also proves the other old saying, “It’s amazing how smart my parents became when I turned 21.”
I was a disillusioned quasi-Dem for a really long time. What really prompted my escape, was getting married, buying a house, having kids in diapers, and running a small business. Too soon, I discovered that I was somehow 'the bad guy', and that I had a target on my back.
One day a customer had a conservative talk show playing, and it seemed like the host was speaking directly to me. Plank by plank, he shot holes in every liberal meme I'd ever heard. Within days, I was digging my under the razor wire.