¶ In the US, where hate rules at the ballot box, this tragedy has been coming for a long time (Michael Tomasky | The Guardian):

Direct responsibility for what happened Saturday? No. Mentally ill people are mentally ill. The Beatles weren't responsible for the messages that Charles Manson heard in their music. But there's a difference. Paul McCartney had no earthly reason to think that an innocent song about a fairground ride (Helter Skelter) would lead a man to commit barbarous acts of murder. Today's Republicans and conservative commentators, however, surely understand the fire they're playing with. But they do it, and a tragedy like Saturday's won't stop them, as long as they can maintain a phoney plausible deniability and as long as hate continues to pay dividends at the ballot box.