conformist - A person who behaves in accordance with prevailing standards or customs, rather than doing things that are different or original.

The hippies attracted people who didn't want to be conformists to the regular society, but actually they were becoming conformists to the hippie way of life.
ambush - To suddenly attack someone after hiding and waiting for them:
The brigade walked quietly to the hidden spot on the hill, patiently until the enemy walked in the valley below, so that they could ambush the unsuspecting enemy, who were taken by surprise.