I don't think there's anything wrong with using 'shock tactics' [=actions, images, stories, etc., that surprise and upset people] to discourage people from driving while drunk.
We 'were shocked into' silence by what we saw. [=we were so surprised and upset by what we saw that we could not say anything]
He got the 'shock of his life' [=he was very unpleasantly surprised] when he saw his own name on the list.
(..) Dialogue: Marked=..,Default,NTP,!Effect,Me dad's a Muggle. Mum's a witch. Dialogue: Marked=..,Default,NTP,!Effect,Bit of a nasty shock for him\Nwhen he found out. Dialogue: Marked=..,Default,NTP,!Effect,Say, Percy, who's that teacher\Ntalking to Professor Quirrell? (..)2001 Harry Potter and the Sorcerer's Stone