Oh, yeah, seen that many times. I still remember a good family friend many years ago. Their son was a great kid; he was an Eagle Scout (old style, not "modern"), FFA chapter president, loved hunting and fishing, a Baptist Christian, very neat, friendly and polite, on his high school's Honor Roll. A real model American young man.
He graduated from high school and went to A&M, which is notable because A&M is a relatively conservative culture. By the end of his first year, he had turned into a smelly, long-haired, atheistic, America-hating freak, and had already been busted for drug possession. He dropped out of college during his second year and got some crap job and never amounted to anything. Sad, but yeah, seen it happen.