Many attorneys view themselves as modern day gladiators or Samurai doing battle, their goal is to WIN.

Kane's attempts to stamp out all vestiges of a competing theory are nothing but an illustration of his desire to win. Not investigate, not even present the prosecution's case in a zealous manner, but to win. To utterly vanquish an opponent and destroy all traces of any "The Ramseys didn't do it" theory.

It seems the BPD's "investigation" has similar overtones to it:
You know the different types of scent-trained dogs and the circumstances in which each type should be used because you were selected to attend the FBI Academy? Well, I'm the boss and I'm telling you 'no dogs'. They want an interrogation in a relaxing conference room instead of a stark-walled police interrogation room where we can rant and rave? Well, then we won't talk to them at all.

Lou Smit is a very experienced and able investigator on the DA's staff? Well, he ain't on OUR TEAM, so ban him from the war room and restrict his access to any information we might ever turn up.

Those Samurai are willing to serve their master unto the death, but they don't consider things like 'truth' or 'justice', they just consider things like winning. Is it any wonder this case has not been solved?