just a freak accident
it was a foggy day but most of the flight was actually fine in terms of visibility. they just hit a lower cloud bank near the end and the visibility dropped to basically nothing, and the pilot lost spatial awareness right in the mountainous area. literally the worst combination that could've happened. If they had flown 10 or 15 minutes earlier or later, the fog may not have been as bad right, because clouds move and shyt.
its just one of those things where literally the worst shyt happened. its like with Nipsey. what if he went with his bodyguard that day? what if Nip decided to leave right after hooking his friend up with clothes like he was supposed to, vs. hanging in the parking lot? etc. etc. etc.
both situations were just a terrible combination of timign and bad luck.