One legitimate approach is to keep ones head down and muddle along. There is a famous saying in Asia -- " the nail that sticks out too far gets hit on the head first" The trick is to get is to get all the nails(Fans) to stand up at once. It is the Korean way or culture for people bow to the societies hierarchy according to status or authority; however, Koreans do protest when the conditions are right and they see an in-balance in power.
First we do not know the whole story about SM and Jessica, the contract is not open for public viewing and the rest of the Girls are under contract clause to say very little.
The stool or chair has four legs on it, SM Entertainment, Girls Generation, Fans
and the South Korea's Ministry of Culture. The only leverage to help Jessica is the fans.
SM Entertainment already has a third generation of k-pop idols in motion as we write. Girls Generation is second generation. However SM Entertainment has a large investment in times( years), money, goodwill in Girls Generation. The last thing SM wants is too derail the whole moving train of Girls Generation. The SM actions all come down to an accounting...