In at least two of the recent three fatal turnbacks, the pilots were highly experienced. At least one was an instructor.
However one should note that the three a/c were homebuilts: Kitfox, Falco (possibly factory built) and the latest an owner design.
It takes some gumption to put a spamcan down into poor landing terrain; even more when it's your baby that you built yourself over several years.
Perhaps for homebuilts there's even more reason to find an airport with long runways and/or landable terrain off the runways.