"While Betts, the Dayton shooter, didn’t leave behind a manifesto, his extensive social-media footprint
provides clues as to what may have inspired him. Federal investigators announced Tuesday that they are looking into his exploration of violent ideologies.
Betts had long expressed support for antifa accounts, causes and individuals. That would be the loose network of militant leftist activists who physically attack anyone to the right of Mao in the name of “anti-fascism.” In particular, Betts promoted extreme hatred of American border enforcement.
“Kill every fascist,” the shooter declared in 2018 on twitter, echoing a rallying cry of antifa ideologues. Over the next year, his tweets became increasingly violent. “Nazis deserve death and nothing else,” he tweeted last October. Betts frequently flung the label “Nazi” at those with whom he disagreed online.
By December, he reached out on Twitter to the Socialist Rifle Association, an antifa gun group, to comment about bump stocks, and the SRA responded to him. (A bump stock is an attachment for semiautomatic rifles that allow them to fire much faster.)"