Yes the 419 scam is notorious in Nigeria, but there are scams all over the world by many nationalities.
Some people find the use of the word "Prince" amusing. Well there are thousands of kings and Oba's of the many regions that make up Nigeria's 200 Million population. So, what happens if a king has a son ? that's right, he has a Prince. In fact its a popular first name.
The outcome of 419 notoriety is a lack of trust in business, which means genuine people will find it more difficult to do business regarding payment terms etc.
Likewise, it can hinder people getting visas, due to this bad perception that some posters are making fun of.
So just like any country that has a "chequered past" its people don't necessarily want reminding over and over again of the actions of a minority %.
As an outsider within Nigeria, I know where Cassidy etc were coming from.
So perhaps next time, people can respect another's stance if they say they are offended ?