That doesnt make sense. If it was done for attrition purposes the effects wouldnt benefit Nixon until well after he is out of office. If done simply as an excuse to target leaders, then those people werent drug users. Which means the drug charges were made up, which means there was no need to make drugs illegal to do it, you could have just as easily made up a similar heinous charge and used that to justify the arrest.
The logic here makes absolutely no sense.