Basically, getting all macho about "overcoming your fear" is BS. If you want to risk your life for the adrenaline high of surviving, go ahead. But don't try to shame anyone for not wanting to.
There might be some meta-fear to go with the peer pressure argument, such as "if I don't overcome my fear and go on this rafting offsite with my coworkers, I am afraid I won't be accepted as part of the team".
I was invited to some rafting trip many years ago, which I didn't go at all. One of my friends went. It was a two-segment experience, he was in the boat for the first segment and decided to get out and walk the second segment. I think he described it as not unlike getting flushed down the toilet, so I thought I made a good choice. Also, nobody got hurt but everyone got sunburns.
https://albertcory50.substack.com/p/how-about-not-overcoming...
Basically, getting all macho about "overcoming your fear" is BS. If you want to risk your life for the adrenaline high of surviving, go ahead. But don't try to shame anyone for not wanting to.