Helicopterinterested.
I think your advertised age and number of posts are the wrong way round.
Secondly, I think your first language isn't English is it?
Third (and this is a serious question) - are you a pilot?
Fourth - you are new here...very very new. Be extremely careful about throwing insults around and at people you have no idea about.
Example: I learned to mountain fly in the Rockies courtesy of the CAF.
I made my first ever landing, over 30yrs ago @ 12000' on a glacier. Within a year I was teaching military mountain flying. Crab is a very senior mil flying Instructor who has been flying longer than you have been alive.
Now - to get back to your witnessing of events. The pilot in question made two attempts at landing because he was unhappy about the first (clue number one). On his second approach he encountered mild white-out conditions but chose NOT to abort (clue number two). Instead he continued with the associated drift and loss of yaw control which you alluded to (clue number three}.
The swiss cheese holes all lined up and 'Voilą' (French for - behold!), He collided with the other parked helo.
Now for 'most' professional pilots reading this - it might raise the question: "why did he elect to consciously ignore any of the three warnings presented to him and press for home"?
And the logical answer is one of the following:
(a) Lack of SA.
(b) Lack of judgement.
(c) Poor Captaincy/airmanship.
For non aviators amongst us - the rules are the same here as they are for every other mode of transport: A moving vehicle collided with a stationary vehicle. You might therefore ask the question - was the driver of the moving vehicle derelict in his duty?
Helicopterinterested, you have to choose now - he's your pilot. Will you trust future fare paying passengers with this guy, will you retrain him, or will you sack him and hire an expert?
The choice is yours..............or is it the insurance company's?