It shouldn't be mandatory in any country to wear it. I support Iranian women who are demanding the decriminalization of the choice of not wearing it.
In countries where it's not enforced, I still think women who make the choice of wearing it take a regressive decision. When the privileged women in democratic countries keep a tradition alive, the tradition precipitates into becoming something solid and unbreakable in conservative countries or lower socio-economic classes(for example: many urban class Indians keep the tradition of voluntary dowry alive, which becomes a forcible social tradition for the lower classes even though its illegal. Ditto for the tradition of weddings being a big, fat and expensive affair).Having said point 2, I would like to make it clear that I totally oppose a complete ban on Hijaab as it's violating to personal freedom and also, ineffective. Unclothing of women is derogatory, even if it was in the form of the Burkini ban in France.Reza Shah's ban on headscarves in Iran was extremely abusive, and shows the negative side of such a ban.
From the wikipage of Kashf-e Hijaab:
“To enforce this decree, the police were ordered to physically remove the veil from any woman who wore it in public. Women were beaten, their headscarves and chadors torn off, and their homes forcibly searched. Until Reza Shah's abdication in 1941, many women simply chose not leave their houses in order to avoid such embarrassing confrontations,and a few even committed suicide. A far larger escalation of violence occurred in the summer of 1935 when Reza Shah ordered all men to wear European-style bowler hats, which was Western par excellence. This provoked massive non-violent demonstrations in July in the city of Mashhad, which were brutally suppressed by the Imperial Iranian army, resulting in the deaths of an estimated 100 to 500 people (including women and children).”Atakurk's ban of headscarves in Turkey for public cloth regulation was ineffective and not a lot of people obeyed it. Later the ban was lifted. Muslim women who hold faith closely to their heart, value hijaab as a symbol of modesty and no matter what it's repercussions are in the larger scheme of things or how regressive the symbolism is, they have the freedom to wear it. Only the complete ban of extreme religious rituals like Sati (practice) or female genital mutilation makes sense and a piece of cloth is not even close to it.