After posting in favor of Africans, you've chosen to make us all aware of your contempt for ordinary Americans on account of their scanty general knowledge.

Nathan,it's time for English class.Bear with me,please!

Scanty means not enough for a particular purpose.For example,the fashion models wore scanty clothes,their partial nudity exciting the red-blooded males in the audience.The purpose of clothes here is to cover the body.
By contrast,scant just means not enough,no more,no less.
By using scanty instead of scant you have implied that the amount of general knowledge a person has serves a purpose.I'd agree with your chosen usage,and in my eyes the purpose is to prevent a person being looked down upon and considered a numbskull by others!
I reckon someone with a biblical forename has shot himself in the foot......LOL!