ye, roles are part of the nature, you know.
The male seahorse has a pouch on its stomach in which to carry babies, it is his role.
male animal species attract female species, it is their role.
some male birds species build their nests, in others females build the nest. it is their role.
mother bear watches over her cubs, father does not care. again, it is their roles.
what is so bad an unnatural about roles? why push so hard against it? where is the real problem?
and by the way, if a woman or a man decides to leave the role, they can, no one will force them to not do so, it is their free choice. but to claim that the roles are wrong is against the nature