Apparently not every knows.
While it is tempting - and perhaps reasonable - to blame this on public ignorance, it also illustrates public short terms memory, and the fact that time marches on. Younger generations that do not live through certain historical episodes tend to not have the same level of awareness of them as those that did.
This one of the reasons why opinions change, as we discussed in 2301. People don't change their minds, but they do grow old, die and are buried with their opinions. Younger generations often to not share the attitudes of their elders - for better or worse.
- Omigod, Who Is Osama Bin Whatevs?