Will the S&P500 exception for the SpaceX IPO open up Standard and Poors and S&P500 funds to potential liability exposure?

With all of the discussions around Standard & Poors plan to make an exception to the SpaceX IPO and immediately add it to the S&P 500, I can't help but wonder if the entire plan is legally actionable. Many people have large investments in S&P 500 funds. If they object to the exception being made, against the core tenants of the principles behind the S&P 500, their only option is to liquidate. Several threads are discussing this very option. But liquidating can cause an unwanted or untimely tax obligation. The other potential issue I see is if SpaceX were to fall in value after the IPO. If investors hold S&P500 funds and lose value on a company that should not have been a part of the 500 due to previously defined rules or language, is that actionable? Is there anyone here who is in the financial legal space who can provide insight?