News of an accident gets attention and our natural first reaction is to understand how it happened so that we can hopefully not step in the same trap, especially as there are a limited number of typical accident types.
The urge to developing an understanding of any particular accident fades with time. By the time the official report makes its way through the mill and gets released, the immediacy is no longer there. Typically the post report comment one sees in these forums is generally much less in quantity than in the weeks immediately after the accident which is another indication that interest has faded.
It is basic human nature to react more strongly to events in the last few weeks than a few years ago.
Preliminary data from accidents does help pilots reflect on what happened and what they need to keep in mind not to fall in the same trap. Much of that will reinforce lessons and SOPs already learned.
Eventually the conclusions and suggestions from the official reports are fed into the regulatory mill.
I have also had the misfortune to witness and attend an atypical fatal accident along with many other pilots at the same location. There was a lot of soul searching to gain some understanding of what went wrong and what we need to do to not have another one like it.