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Luigi Mangione, CEO shooting suspect, is a tech worker
(www.bbc.com)
This is a most excellent place for technology news and articles.
They know the guy is a engineer. They came up with the 3D printed gun because it fits with the character, and gives politician an excuse to ban 3D printers all together, "for our safety!".
I'm speculating and being a conspiracy theory, but in theory this could make sense. Nobody will ever find out the truth, I'm afraid.