I think the problem is the hens are watching the fox design the coop. They've been invited to participate, but the fox has unlimited resources at its disposal for research and planning while the hens are of meager means.

So yes, it may be unkind to prejudge the fox, but based on years of prior malice towards all poultry in the yard, and without fully understanding its plans, we have to assume it won't turn out well for us chickens.

Cluck.