Why did people ignore the warning that ran in newspaper in the days leading up to the lusitania voyage?

There were two major reasons why people did not believe the warning specifically with regards to the Lusitania. The first was that they believed that the size and speed of the vessel would render it impervious to potential submarine attacks (submarines having not yet been fully established as capable weapons of war in the eyes of many). The second was that the public believed that the Germans would not attack a passenger liner, as it was against the rules of naval engagement.