I'm not sure what is meant by 'based on his own personal involvement'. KD has reported on different cases, but I believe his cases/stories are assigned to him by his superiors as he works for an employer. I'm not sure if he has reported on these cases, but simply considering the facts in some cases that we DO know, it doesn't kill us to have a reporter following a case and reporting on it to the public, imho.
Like it or not, LE has indeed screwed up MANY times in the recent past. Cases immediately come to my mind right off the top - Laura Babcock, the gay village murders, Wayne Millard, Tess Richey, Audrey Gleave (imho), the recent Nova Scotia mass shootings, and I'm sure there are plenty more both recent and historical. Thankfully KD is not beholden to LE for what he reports about them. He *is* beholden to keep the confidentiality of his sources if that was the agreement made. He's not out to get anyone fired or disowned. I don't feel like he just goes around willy nilly interviewing just anyone, no matter if they really know anything at all about the cases he covers.
To me, it is completely unreasonable to expect a news reporter to guarantee the words of those he interviews. Nobody can do that. Which 'other side of the story' are you referring to? It seems to me that KD has made attempts to speak to everyone involved in any way, anyone who knew the Shermans, etc. It seems to me he IS trying to get all kinds of sides to this story, personal perspectives, a personal touch about the victims, whatever. Personally, I'm grateful for reporters who do NOT give their opinion, and only report the 'facts'. The 'facts' in this case for him, are the words and other documentation or whatever, that his sources have provided him with. I believe he does check out things as much as he can. He is not LE, so his abilities in that regard are stifled. LE is privy to all, but they are silent, as always. For me, I like to hear the back-stories and such, rather than have total black-out until a trial comes years later. We can pick and choose what to believe and how to interpret things, and to just ignore as well, etc.