WWII in HD

I was just watching WWII in HD on the History Channel. It has actual color footage from World War II. It is hard for me to even imagine people fighting WWII in color.

The show started with this disclaimer:

Some images are graphic in nature and viewer discretion is advised.

Huhh? What is the nature of the other images? How could an image be anything but graphic? Does this channel sometimes show non-graphic images? Does it then say that viewer discretion is unnecessary? How could you even have a viewer of a non-graphic image?

I am sure that this sentence was carefully reviewed by a team of executives and lawyers, so as to fully cover themselves of any liability while not scaring anyone off.