Doubt there is much of an issue with using shocking images or similsr methods in order to ensure people understand facts about the risks they need to make decisions on.
However this is different to raising the fear level in order to push people to choose one way or the otherlon political issues.. as we have been seeing on EU membership, responses to immigation and so on. Or even intimidation or socisl disapproval to force people to vacinate "for the common good" rather than their own, or not to vacinate for political/religious reasons.