We're actually very much on the same page with this, LayzeeDayzee. In fact I'd go much further. There is absolutely NO reason for LE to make any public statements of any kind on this or any case, and I dearly wish they would refrain from doing so beyond, possibly, a request for public help from time to time when someone is missing or a bad guy is on the loose and, even in those cases I feel they should exercise cautious restraint.
In the US where many roles in the judicial system such as the Chiefs of Police we've all grown accustomed to highly energized press conference circuses with police jockeying for position in front of the camera to make breathless pronouncements about the current status of some crime or other. Theoretically these are meant to show the public that everything's under control, the police have the emergency du jour in hand etc. The unspoken message, (sometimes loudly spoken) is that if the police only had more money and more gear the emergency wouldn't have arisen in the first place. The unspoken message on the next layer below that one is Vote For Chief "Gotcher Back" because crime is on the rise and only he can control it.
In Canada where police and judicial positions are not subject to the whim of the electorate it's somewhat more puzzling why the police here are now becoming media hogs too. Statements about having a suspect in custody suggests to the public that the emergency is over, the criminal is securely in irons and everyone can breathe easy. But then, there's the suggestions some more murderers of random targets might be out there but LE has no descriptions, at least none they're willing to share so the media, and yes, we here on this website too start trying to explain the unexplainable and building the case against the only individual in the sights.
Frankly, if I had my druthers, I'd call time out. LE should quietly and diligently follow all the leads they possibly can to get to the bottom of this horrible, seemingly senseless crime. The Media should get out there and dig, scratch, cajole and otherwise scrape up every morsel of information they can. Neither one of them should be giving our imaginative musings on websites like this the time of day. I have a sinking feeling that among the victims of this terrible event we can count members of several generations of the Millard family, their friends and associates and, even should DM be found innocent of this crime, this damage will not be undone. If this should be the case it will be, imo, almost entirely the fault of social media - the nouveau chattering classes.