I do not think the pilots should ever return to Brazil because they can not expect a fair trial. We all know they followed the rules and did nothing to cause this accident. Maybe design flaws in their aircraft caused the transponder to go to standby but they didn't design the aircraft. Going back there would be a big mistake. When ATC puts two aircraft on the same airway at the same altitude with GPS accuracy in opposite directions bad things happen. TCAS was not designed for separation of normal traffic, it was designed to avoid a mid air if ATC screwed up. If it quit working it does not take the responsibility off of ATC.