If you own a drill and you bolt you better watch out! YOU are the root cause of this accident! No bolts and none of this would have ever happened!
Back in the late '80s and early '90s when the scourge of sport climbing first got rolling I predicted that route developers could be potentially liable. I've drilled a lot of bolts, almost all 8mm Petzl self drives, because I was doing it for me to get to the top. If someone else wanted to repeat the climb, well, that was cool but not the primary consideration and no claims made for the gear--that was essentially residue from my ascent. However, if you develop a climb specifically to be repeated and make that fact known and even promoted via guidebooks etc., then I think you have assumed a greater degree of liability. It's probably a testament to the over engineered nature of modern bolts and the lack of siezable wealth of most climbers that this hasn't come up yet, (that I'm aware of).
I also predicted (hoped) that climbing would develop to where the cutting edge would be for young hot shots to climb 'sport' climbs attempting to avoid using as many (or all) of the bolts as possible (has to be done on sight to be fair) and then removing the 'unnecessary' bolts. They could then string the hangers into a necklace as trophies. It would be immediately obvious then who the big dawgs were. Psyched when Trotter essentially did this with 'The Path' at the back of the Lake, but it didn't catch on. Yet.