yeah i think appealing to fabrication can be a bit hand-wavy sometimes. like you're saying it's fabricated like how other things are fabricated (since as we all know fabrication happens). but not every fabrication is the same or equally as easy to pull off. to say it was fabricated doesn't say anything about how it was. but that's not even a question that enters ones mind when they think of fabrication. how? well how anything else is fabricated of course..

it can be as much a reaction of disbelief as it is an alternative explanation.