Why haven't they been killing the zombies with fire on "The Walking Dead" since Day 1?

Alright, I've waited five days, so I don't want anybody complaining about me spoiling the second-half season premier of The Walking Dead.

Back at the beginning of the season, I got really annoyed with Rick's stupid plan to try to get the thousands of zombies trapped in the quarry to follow the group away from their home.  Nobody was able to come up with a better idea than that?  I remember thinking "Why don't they just throw a bunch of stuff on fire down into the pit and hope it burns them all?"  Maybe it would've worked, maybe it wouldn't have, but if it didn't the zombies would still all by stuck down in that pit and the people above would be no worse off.

So imagine how annoyed I got this week when they killed the zombies with a huge fire, one that also happened to lure them all in?  Hey morons, why didn't you just try that from the start instead of leading them on a wild goose chase all over the place that led to the destruction of your community and the death of most of your people?

And more importantly, why didn't anybody figure out a long, long time ago that all you need to do is light a fire and the zombies nearby will walk right into it and kill themselves?  That could've been a pretty useful skill to have over the past six seasons...


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