There's nothing wrong with the Walker trigger. There is something wrong with people who tinker with them without the know-how to properly adjust for sufficient sear engagement. There's also a problem with folks who leave their hunting rifle in a closet 11.5 months out of the year, then take it out, fire a few shots and proceed to toss the weapon in the back seat and drag it through the woods in wet, muddy or dusty environments, then put it back in the closet when they come home, never bothering to clean beyond maybe the bore and a bolt wipe down.
Any firearm can malfunction with dirt & debris, corrosion or sticky, dried out lubricants in mechanical assemblies. There's just a lot of Remingtons out there, nearly 8 million with the Walker trigger, so more of them that suffered fudd neglect and hack trigger adjustment than other sporters.
I have quite a few Remingtons with Walker triggers, never an issue. But I have had other firearms bought used that dropped hammer/striker/firing pin without pulling the trigger because they were dirty, had worn or broken parts, or because someone who shouldn't have screwed with them. I don't blame the gun design, and observing the 4 basic safety rules prevented any injury or damage from resulting.