Germany defended its aggression, claiming Lusitania had carried weapons and war supplies and was therefore fair game. As they continued to divert blame, British propaganda against them snowballed.
The phrase "Remember the Lusitania" was used as a battle cry both by Allied soldiers and on posters used to recruit new soldiers to the army. The Germans claimed that sinking the Lusitania was justified in a war zone because its cargo included ammunition and shell casings to be used in the war.
Similar to how the Declaration of Independence was written to free the American colonies from Great Britain and their ruler King George III, the Declaration of the Rights of Man and Citizen was written to free them from King Louis XVI.