Lusitania: Murder on the Atlantic

Indeed, this one is remarkably controlled, but it does include key facts that the British wanted covered up:

• that their embargo of Germany was the first and bigger war crime;
• that Churchill wanted the Lusitania sunk, and in typically murderous fashioned schemed to make it happen;
• that the explosion of illegally carried war materials, especially gun cotton, caused the second and greater explosion;
• that the Admiralty first covered up and then destroyed all materials relating to the incident;

And much more. Anybody who argues anything else has not studied the subject in depth; one need only consult THE authority on the subject, Patrick Beesley, in his authoritative Room 40 to know this. None of this is "politics": it's all facts.