I think part of the reason why poor wx accidents recur with such regularity is that there is little realistic flying training in this area. Part of this could be that it is very common to have instructors teaching PPLs with just a few hundred flying hours.
The other aspect of this is, of course, poor "supervision" (as in my first post) especially amongst the owner population and even more so amongst the off-site-owner population (no Joe in the Tower to pass comment as the voice of last resort).
Supervision, as a part of captaincy, does not have to involve a regular FI check ride, or more regaulation by the appropriate authority.
It can, as a part of captaincy, rightly include effective self briefing on wx/ sites/ en route weather/ hazards; consultation with other pilots, including the FI and personal limits.
If there is no risk, then nobody ever leaves the circuit. Too much and they die. The line between the two is difficult to assess without experience, hence the importance of some form of ongoing supervision and training over time, to keep practices sharp (& the LPC does not do that).