how about the guy who's plan was to kill the folks next door for their stuff so he had a better chance to make it thru the attack?
"you know our plan jimmy you shoot old man smith and i'll do the jones house,bring back all you can carry to our shelter"
and don't think that's not someone's real doom day plan.
the kids they found chained up in that house is just the tip of the iceberg on how crazy the country is.
it's not how to make a fool proof warning system it's how people would react to it.