The media is a business, and they focus on whatever shiny object is in front of them, hoping that’s what their audience wants. It’s only partially about reporting the news, it’s at least equally about ad revenue and keeping an audience. To quote a comic book “the press loves blood as much as any tick ever born.”
And the migrant caravan could be the gift that keeps giving-- if the militias running to the border start shooting at innocent unarmed people the media gets to cash in again. It’s a win-win situation, well. . . except for those who get shot, I guess.