Well the iron sights of a firearm are fundamental to accuracy so if you are not able to be accurate with them you in effect will never learn the fundamentals and will not be very effective with anything else that and an optical sight can fail or get damaged so you'd better know how to use the basics.
My guess is that Mr.Hayha was concerned about the chance that light might shine from a scope and give away his position that and it sounds like he stalked alone with no spotter to help him maintain situational awareness which you do lose some of that looking down a scope at least what is closer to you anyway.
Someone got him with a dumb-dumb round it seems I have heard this from a few sources.
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