Hijab is an obligatory practice on every Muslim female. Non Hijabi female working or mixing with men causes them looking at her hair or arms or legs which is itself not permissible for the men. We should cause any sin to any one. Discrimination is bad against people with equal qualities, but encouraging non Hijab is completely wrong and means disrespecting the orders of Allah (SWT).
Muslim must obey the orders of Allah in every matter and every field of life.