Unless you have experienced vertigo while in actual IMC - Instrument Meteorological Conditions, you will not fully understand the physical FIGHT it is to force yourself to ignore your "seat of the pants" and inner ear and instead trust your instruments.
Your senses are screaming one thing at you and your instruments are saying another. You learn Instrument flying procedures by instruction, but LIVE them by practice, practice, practice.
If people don’t always do what they were trained to then they have not had enough good, recent training.
BTW, I have flown actual IFR in fixed wing aircraft (T-28B/C) and in helos (TH-1 E/L, CH-46 and CH-53D). I have also tried (once, successfully) "popping up" through a ground fog layer that proved to be far thicker than I expected (500+ feet) in a non-IFR equipped Bell 206B Jet Ranger. Thankfully, the basic VFR "6-pack" gave me enough reference when I lost sight of th ground. Also, I did not attempt any turns while "in the goo". And I never again let myself get into that situation.
Clever editing to ignore my actual points.
People are people.
People make mistakes.
The most highly trained person in the entire history of the planet can still have 5 minutes of not thinking and screw up. That’s how the vast majority of accidents happens, some person, who should know better, didn’t for just enough minutes at just the wrong time.
” force yourself to ignore your “seat of the pants” and inner ear and instead trust your instruments.”
I’ve been watching a lot of these “air crash” videos lately, and another issue at least with modern commercial aircraft (Airbus, Boeing, etc.) is relying upon what the computers are telling you even if they’re telling you several conflicting things.