Knowing what's more likely and what's less likely is still useful information: social media turning bad is a daily occurence, while dns registrars' family members have been safe for a pretty long time now.
Harassing people is far more accessible and has a proven track record of success.
Do you have examples of someone successfully harassing a registrar employee into breaking the registrar's ICANN accreditation terms?
Not so much with social media where the respective tyrant has a TOS that makes it clear they can tell you to pound sand whenever they feel like it.