My condolences to the climber's family friends and coworkers, very sad indeed.
Having worked with an inhouse crane for many many years, and a wide range of big cranes from 75 to 300 ton hydrocranes over 40 years at this.
The fault falls on the climber IMHO.
There are plenty of amateur CO's who don't belong anywhere near a big tree, and if you play this game long enuff, you'll almost inevitably bump into one.
The question's do you value your life enuff to tell him to fold up his crane n get the fug off the jobsite?
Had I done that very thing twice, actually three times, Id've saved myself a world of hurt n professional embarrassment.
Working with cranes, particularly big one's, creates unique hazards that demand emergency escape routes being planned for, unencumbered, and accessible in an instant.
You don't want to ever be trapped in place with no means of escape.
Personally I've shunned synthetic rigging my whole career, unless used specifically to insulate the crane when in proximity to bare energized lines.
I like wire rope n clevises just fine thank you, no bouncy bouncy, no energy stored in the rigging, fug that.
A local crane Corp here paid all my medical bills when their CO ignored my specific instructions not to brush any live trees with any picks, even though doing so meant him rotating 300 degrees to do so, we had time, there was no rush.
But the young punk CO fresh from Alabama, got tired of rotating such distances, used the end of his boom to knock the single live limb encumbering us off completely, no more rotating, on the big trunk pick.
Unaware that he'd knocked the cotter pin off a steel bar at the end of his boom, he rotated the boom over me on the trunk, but stopping rotation caused the steel bar to slide outta the boom sideways, then fall about fifty feet before hitting me on the left shoulder, fracturing my clavicle into kindling, that had to be reconstructed on titanium plate, curved to match the bone.
It's your life dang it, protect it as zealously n loudly as necessary.
It's his fault for workin with a flakey CO.
Firing folks n kickin em off job sites can save lives IMO.
Jemco