My point of view, it's hard to teach accountability without practicing it. You may not be thrilled with the level of players LA development is churning out, but are you sure you can pin that on the flaws with development, or is it the picks the team has made? Not trying to piss on the scouts either, the picks LA did have weren't all that early. Take Kaliev. He fell to the 2nd precisely because outside of scoring his game was absolute mess, and nobody wanted to take that project on with an earlier pick. He seems to be coming along fairly well for where he was picked. The only guy that seems to fall short of the expectations is maybe Turcotte, but his offensive game began to sputter even before he got into the Kings hands, and he wasn't rushed to play bottom 6 role in the NHL either, but brought along slowly through the AHL. I am more inclined to say in the hindsight he simply wasn't as good a prospect as he was ranked going into the draft, it happens.
TL;DR. I think LA development has done fairly well with the prospects they did manage to get their hands on in the draft.