Earlier quoted context omitted.
I'll go further and state that the only reason this ignorance was dangerous to him was because he stupidly put himself in a situation where it could be. Everyone should know that the wilderness can be dangerous for countless reasons, that isn't really something you can be ignorant of. Not making an effort to eliminate ignorance before putting yourself in the path of danger is stupid. Put it this way, scuba diving is…
I'm not sure you read the article. He did make an effort to reduce his ignorance. He was knowledgable on what was and was not edible. He had the same knowledge that everyone else had, prior to the investigation of his death. It is only after investigating his death that we know that eating those seeds, while in extreme caloric deficit, is dangerous.
"After subsisting for three months on a marginal diet of squirrels, porcupines, small birds, mushrooms, roots, and berries, he’d run up a huge caloric deficit and was teetering on the brink. By adding potato seeds to the menu, he apparently made the mistake that took him down. After July 30th, his physical condition went to hell, and three weeks later he was dead."
Stupidly, he remained ignorant. That ignorance resulted in a weakened state, which allowed the seeds to be dangerous.