It's sort of a recurring theme in crank conspiracy theories that the shadowy perpetrators have a paradoxical level of competence. In so many of these narratives the Powers That Be are able to pull off ridiculously wide-scale levels of control and subterfuge, but are weirdly incompetent in some very specific, simple way: Mind control rays being thwarted by tinfoil, Illuminati agents who compulsively implant secret Illuminati hand-signs into everything they do, evil Xtian prayer warriors whose prayer bombs are thwarted by plastic children's toys, etc.
With that in mind, this one is refreshing in that the aliens being big, stupid dumb-dumbs who have no idea what they're doing is explicitly part of the conspiracy narrative! It makes total sense that aliens who are so bad at their jobs that they've accidentally rendered themselves sterile and keep accidentally giving people autism wouldn't be able to work around people wearing a plastic bag on their heads or keeping things in locked cabinets even after over a decade of study!
EDIT: Additional tag suggestions: "Everyone is Out to Get You Motherfucker", "Misguided DUI", "golgafrincham", "Abductions", "You are under psychic attack", "Somehow Not a Blue Öyster Cult song"