"The shooter visited California once, where they were radicalized by the violent left."
"The shooter owned an iPhone, which is designed by Apple in California. The violent leftists are responsible."
"Liberals, who constantly demonize conservative speech, are responsible!"

There need not be any actual ties to Los Angeles, Chicago, or DC. They can cut any narrative they like from whole cloth. Denying reality and substituting their own is the rightist way.