Pearl Harbour and Nanking - you've got them wrong!

Someone commented on an Economist article:
 

"(remember) pearl harbour sneaky attack where thousands americans killed and ships sunk.

....(and) nanking massacre---where over 300 thousans weak and timid chinese civilians were butchered and raped".

Still this ??  It's really hight time for people to know!

Pearl Harbour: Roosevelt knew about what was coming beforehand, replaced the most advanced battleships with the old ones at the Harbour and let Japan attack first. The US then already had the advanced code-breaking technology and grasped almost all the movement by Japan. So it was not at all a "sneak attack" by Japan like everybody eagerly wants to believe.

"Nanking Massacre": China, who makes mountains out of molehills, had said at the League of Nations back then that 20,000 people were killed in Nanking, meaning less than 20,000. On top, most of them were soldiers who were disguised as citizens, and not civilians.

Remembering wrong things doesn't serve anything. If you are one of those who believe "Pearl Harbour Sneak Attack" and "300,000 killed in Nanking Massacre", please do update your knowledge now!