Actually, the inability of any society to resist immigration, the inability to find other solutions to the problem of employment at the lower, more physical, and menial levels of the economic process, is a serious weakness, and possibly even a fatal one, in any national society. The fully healthy society would find ways to meet those needs out of its own resources.
The essence of taste is suitability. Divest the word of its prim and priggish implications, and see how it expresses the mysterious demand of the eye and mind for symmetry, harmony and order.