A soil scientist knows that soil is made from parent material. When the parent material is all gone, soil can no longer be made. Without soil, no food can be grown and you will die of starvation.
Same is true with plants. Hybridizing plants can be dangerous if the pure strain is not protected against cross contamination. The pure strain has survived over the course of time which is why it is survived to today. The hybrids have not. True, the plant hybrids offer advantages for today but, they have not survived without mans intervention, nor would they even be in existance.
I think the founders understood that their/our survival then, now, and for the future is dependant on the purity of the genes.
As for the animals why is so much value payed for pure breeds?
Forced integration has people believing that Human race is a race. So is the horse race just a race? Is the dog race just a race? Why is more value placed on animal genetics than humans?
On a world scale the caucasion people are a dying race. Soon they will only exist as hybrids. Is this the reason the founders wanted to end slavery and repatriate them off the continent? Not as a cruel thing against the negroe, or a hatred against anyone but, rather a love for ones family genes. To preserve a unified pure race people living under one unified nation.
The fact that the founders had purchased land in africa for their return shows they were trying to help the negro, not hurt them or hate them. Restitution was being made. It is in the best interest of all that repatriation continue for the survival of the races, and the survival of this country.