CT, I agree - that's why there is an investigation after air accidents.
Unfortunately, human factors will always play a part in accidents to humans. This pilot has learned a very severe lesson, one that has been learned many times before.
Having said that, flight from VMC to IMC and back to VMC can be safely managed but the time to plan it is on the ground, with a chart on a desk, not halfway up a rising valley in an aircraft not well equipped for the job.