Yet none of those links advise what to do when responding to an RA generated in response to an incorrect modeC. You seem to be under the impression that RPT aircraft will only encounter other RPT aircraft, who's transponders are checked daily, nay, every leg. I am sorry to have to warn you that in aus under the changes as of Nov 27, RPT jets will daily encounter VFR aircraft operating without clearances in classE. These VFR aircraft don't necessarily have their transponders on, have them in verified condition, or even be on the same frequency as yourself (note-see recent incident DJ737 vs C421 near CANTY nth of MEL at FL175). Now, take the same situation and have it occur at Alice Springs or some other non-radar classE, and tell me again how TCAS will help you then?
You are no longer only worried about controller stuff-ups. You now need to worry about perfectly legal VFR operations (or simply blunderers), as well.
Post all the links you like about TCAS- it doesn't do jack if the other guy doesn't have a working, accurate, switched-on transponder.