@Rahimdad thanks for your feedback, indeed the majority of the accidents posted on this thread were mainly due to people tried to fight gravity or lack of attention and ignoring safety matters. i was trying to clarify whether the 2WD was intentionally chosen or if it was genuine human error (i.e people forgotten to switch to 4 wd) but your replies (that thank you all for your input) covered me!
have to say it is very interesting topic and in theory i learnt a lot, i will try to keep all these advises in mind when i am off roading!