I haven't got time to read the whole thread unfortunately, but:
Certainly, quite a few of these 'Extreme Outdoor Adventure' types that I've met, have been quite arrogant, and it seems that they use the 'sports' as a way of showing off; 'look how hard I am'. I've met people who've actually boasted about having to be rescued by helicopter and stuff. Stupid ****.
Of all the climbers I've known (and I used to climb) I never knew anyone who was in it for the showing off. Maybe sport climbers are like that, but mountaineers? I can't imagine it.
As for the risks - it's up to you as a node in the great social/personal network to make sure that the people you know and love, and those who love you, understand that you are doing something risky (could be climbing or mtbing, anything), why you are doing it and what the consequences might be.
Personally, I find it a truly wonderful thing that our society values the richness of life enough that people are prepared to devote their lives to providing the safety net that we need to explore it without complaining and often without even being paid. That goes for mountain rescue, race marshalls, paramedics at mtb events, motor racing events, marathons etc etc.