As an aside, I have had 2 aircraft ignore RAs.
Nose to nose, climber assigned level below, descender assigned level above. D asks "who's the traffic"?(obviously in response to a TA). I pass traffic to both, and the plan. As they pass (seperated), the climber says "oh, and we had an RA". I asked the descender, and he agreed he had one as well, but obviously elected to do and say nothing as it might confuse things. After reading the incident report, I learned that the TCAS had wanted the descender to increase descent and the climber to increase climb, something I didn't realise TCAS would do (cross levels). I now know a lot more.
But if you think Bodensee could never happen again, think again.