It's not crazy at all, and it wasn't crazy when people were saying it at the time. The downside of not agreeing to the 175mil deal then is exactly what happened.
How much will any extra money above the original 175mil even affect his quality of life? Another 30, 40, even 60 million on top of that isn't actually worth that much. It wouldn't change his life in any meaningful way. A lost season and a devasting injury on the other hand, definitely could.
So saying freak injury as if that means anything in regard to his contract situation is laughable. The NFL is a breeding ground for freak injuries