One thing that Sarah found out about Karyn was that she was very interested in becoming a veterinarian some day. Another thing she learned was that Karyn was very studious. School was important to her and, of course, if you wanted to become an animal doctor, then a good education in high school and college would be needed. So what better way was there to ruin that dream than to make Karyn the type of person who was both unreliable and undereducated?
And what better way was there to do that than by turning Karyn into a hippie girl? No person would let her treat their pets and animals if she were stoned out of her gourd most of the time. Her life long dream of becoming an animal doctor would essentially be flushed down the toilet.
As for Jon, he had nothing against liberal ideas, since he considered himself to be a liberal person (okay, maybe a liberal-moderate). But this was taking it too far. He cared too much about Karyn to let her squander the rest of her life getting stoned. She'd probably drop out of school, maybe even leave town (on a quest to find her chi, or whatever). Jon may never see her again.
Sarah giggled to herself, delighted in her own clever cruelty.
Back at her house, Karyn (who discovered that she had a new "hippie name") stepped out of the shower and into a new life.
