I was just about to post this. It's a great example of the accident chain of events and how often its a couple of mistakes that compound to bring down a plane. High density altitude, altimeter indicates 6,300 feet, they said it was warm out. This probably demonstrates why the plane refused to climb, it was doing all it could do. No performance planning. Not aborting the taking, even after the plane wouldn't rotate for thirty seconds, still not putting it down in a clearing when there was a shot.
Again, all armchair piloting, but as said above, "come on!" ... This should not have happened.
On the plus side, it looks like he flew it into the trees, instead of dropping it in. Intentional or not, it worked out.
This is a solemn reminder of how much non-flying passengers put their lives in our hands. They trust that we know what we are doing, and know what the plane is capable, or incapable, of.