A growing number of prominent journalists have declared once-bedrock press principles like fairness and objectivity to be outdated and unnecessary since the Donald Trump era rocked American politics, and while some observers appreciate the honesty, others feel blending opinion and reporting makes for a "dangerous time" in America. 

As media members like CNN's Jim Acosta and PBS' Yamiche Alcindor became heroes to the left for their antagonistic approach to the president, who derided them and other reporters as "fake news," more journalists are leaving behind the image of the disinterested, impartial correspondent.

"I do think it...