Personally, I do not find TSA Press Releases or any references relying on information from Wikipedia to be authoritative and legally-binding on my actions.

Absent proof that TSA has been granted the statutory or regulatory authority to pull the actions that were expressed in the OP, I operate under a limited government attitude. Prove to me that they have the authority to act as they did, by doing the research with direct links to the relevant sections of the USC or CFR and I will accept it. Absent that information, TSA is limited to the search for WEI, as has been shown in many links provided in this thread and others (see Fofana for the most recent example of a court slapping TSA for overstepping their statutory authority).

As for your assertion about child abuse/neglect and the immunity clauses, TSA is probably covered by that. However, those clauses all rely on the person reporting the claim to be reporting it to a valid LE entity, not taking it upon themselves to insert themselves into the mix and perform the investigative work. IANAL (unlike PTravel and others), but, IMO, a TSO acting like the ones in the OP would not be covered by those clauses. A TSO reporting a claim to a LEO for review by LE would be covered under those clauses.