I went to journalism school and giving sources prior-review over a story is about as unethical as it gets.
Getting access to a source doesn't mean softballing everything for the benefit of the source. With the email scandal for instance, those stories could be written with or without cooperation from Clinton -- you simply say: we're running this story, care to respond? If they are 'mad' at you, they are the ones that miss out on getting their side represented. Reporters ought not be 'negotiating' anything. We have a story, we're going to run it; if you want to respond, here's your chance, if you don't want to respond, we can report that as well.
Journalists in many organizations have sold themselves out. It's no surprise that most of them are Clinton supporters. The days of Walter Cronkite objectivity have seemingly passed.
The media colluded against Sanders not even to mention all of the Republican candidates.