The Pursuit of a Journalist

How far is too far? I recall in the past seeing interviewers being shut down for asking questions infringing upon one's privacy. Is it voyeuristic? Being a watch dog? Salacious or sensational? Recently, I was trying to acquire material for an article. I highly admired and respected the individual that the story would be written on. However, in my questions, I included a question that was much too personal. The interview went awry and I felt humiliated. Lesson learned. This was not some pursuit of truth. It was a lifestyle story. 

Journalists are willing to go overseas to lands unknown to places far and wide in order to obtain a story. They are on the search for truth. It sounds really cool being a "watch dog". It's hard with these endeavours, of finding a balance. I am reminded of The Adventures of Tintin. 

To be honest, I am a bit scared. I am reminded of journalists who lost their lives for the pursuit of truth. Let someone else write it. There are those who are anchors in GMA and those who are right in the middle of bombings in Aleppo, Syria. I really don't know where I am going with this. But perhaps the question I have is when should boundaries be made? Or are journalists limitless in a sense?