And that would be for two reasons. Number one, it turns serious conversations into silly ones. If you are referring to, say, inner city blacks, just go ahead and say inner city blacks. Why be so timid?
And two, the use of "Amish" just bores me personally. It's like an old joke heard for the hundreth time.
Of course, you might feel differently.
It was obviously Quakers.
Because Amish is shorter to type. It has become a meme around FR that will be hard to eradicate. Part of it is that, through irony, it points out the undeniable existence of statistical group differences.
Of course, you might feel differently.
Am I allowed?