I always liked the idea that the Praxis incident was a failed weapons test, of the klingons attempt to make a Genesis Torpedo. It's why the Klingon atmosphere is FUBAR.
Also, I always saw Changs BoP as the ultimate blending of the three powers technology, Klingon ship, romulian cloak, federation torpedo technology.
The film suffers from the loss in editing of the federation military industrial complex players pushing for a starfleet invasion. They are sitting around the office when they are watching the trial, and still named in the credits.
So, you have the federation military industrial complex wanting war for profit, starfleet elements wanting war because they fear obsolescence due to peace, you have Klingons wanting war over honor reasons, and romulans wanting the Feds and Klingons fighting so they can step in and take over.