Then doesn't it make sense to have a proper necropsy done to find out what the underlying problem is? Wouldn't one want to know? Many talk about culling the weak, or just letting them die, but no one seems interested in finding out what the cause of the illness was. Maybe I'm in the minority for wanting to know?
		
		
	 
No you're not in the minority. I thought we were talking about worming, not the facts of life. Things die. Birds die, cows for, we die. 
Most folks here are hobby chicken keepers, not vets in training. Some will lose one bird and not bat an eyelash, where someone else may spend hundreds of dollars in fecals and wormers and necropsies. For a chicken.
No, it does not make sense to have a necropsy done for every single dead thing on the farm. If there's an outbreak, more than one bird is going to show signs of it, and if only one bird dies, its kinda obvious that that specific bird had weakened immunity. 
The first place I would actually look is not in a dead carcass, but the soil. 
Oh, but this is just if we are in fact still talking about worms.