Seleco,
The current TCAS system, (TCAS 2) can only provide vertical collision avoidance. The reasons behind this can be read elsewhere on this thread, or do a search in Tech Log.
Ruslan
No professional pilot is going to try blame anybody until a full investigation is out (and probably not even then - more than anyone we realise how an honest mistake under time pressure can appear negligent to an armchair pilot).
However, can I just point out that if your belief number 5 is correct, then they, or their training, were at fault. I'm sorry about this, but you are the one suggesting that they had a climb RA that they manouevered opposite to.
CPB