The transitive PTSD from your fellow pilots dying is real. I quit after 800+ flights (including motored, and yes it is incredible) after the 5th death of someone I'd either been close to or at least on adventures with. Not to mention all the broken vertebrae which is a lot more common than death. In the span of a few years I saw three ridiculously experienced instructors (one had like 8,000 flights) smash into the ground, then spend 2 months in the hospital and a year recovering.
The fact that we know what mistakes they made is a red herring. You'd have to be a fool to think you're going to be the first paragliding pilot in history to never make a potentially fatal mistake. One of them, a friend and a very good pilot, simply pulled his brake half an inch too far. It was a perfectly calm evening.
There were two warring factions at my local mountain. One organized around the idea that paragliding can be made safe. My camp maintained that 'safe' and 'paragliding' should never be in the same sentence without an 'isn't' between them. Hikers always opened conversation with "Is it safe?" The other camp would say "Oh yes, quite, and would you like a ride for $200?" Our camp would try not to laugh. I'd usually reply with, "Does it look safe?" We said it was all about risks and percentages, with the understanding that the risk of dying or being crippled with a slow glider in perfect conditions is always > 0.
I'm not saying it isn't worth it. It's totally worth it, though it's easier for me to say since I got out unharmed. Rather, I developed a discomfort that prevented me from enjoying it. Not fear - but a kind of disillusionment. Because even though my instructor said "It's not safe." over and over, and even though I repeated it to others, secretly I believed it was and it took 8 years for observed events to wear that belief down. A big part of me hopes I return, maybe after my parents are gone or I'm their age or something. There is really nothing like it in the world and I doubt anything I ever do will ever energize my soul the way free flying did.