I am sure many do not even consider an off airfield landing as an option preferring to battle it out often as in this case with tragic consequences.
This is where the mindset of the glider pilot differs as an off airfield landing by a glider is far more accepted and expected than with a powered aircraft.
I think very dependent on type, Gliders are designed to land in fields, many GA types are not. I have no experience of gliding but I am guessing stall speeds, air breaks, and low weight all result in substantially less kinetic energy than many heavier GA aircraft which as I have said many times before I would be very reluctant to land in an unknown field.
I am not aware of the landing characteristics of the aircraft in this incident but I would suggest a complete handful and very uncertain outcome for any pilot, however competent they are, when you take into account the generally reported low cloud base and pretty dreadful weather.
The first mistake I believe this guy sadly made was driving to the airport.