It's funny the article should mention Austin, since there was just a mass stabbing there ( https://www.dallasnews.com/news/crime/2017/05/01/multiple-pe... ).

Rifles are on the order of 20% as likely to be used to commit a murder as knives ( https://ucr.fbi.gov/crime-in-the-u.s/2013/crime-in-the-u.s.-... ).

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Regulating what people can build in their own homes is not a good idea, nor is saying "this set of machine blueprints is legal to possess, while this other is not". The hacking community has known this for a long time ( https://www.gnu.org/philosophy/right-to-read.html ).