Is hijab just a scarf?

I had a discussion earlier with my genius friend who was debating the fact that the hijab is not a religious duty and wondered why we didn't follow the western model in giving both men and women the absolute right to practice universal freedom without any restrictions. All religions; whenever they imposed restrictions on personal freedoms, they did that to avoid social chaos, especially in the relationship between man and woman. Based on the Islamic law, we as humans should be committed to the wellbeing of our societies and control our desires. Hijab is considered to be a symbol of moral commitment if the woman is committed to the teachings of Islam and follows its basic rules.
The purpose of wearing the hijab is to create an atmosphere of resisting the desire of deviation and create an internal immunity for both males and females. It also helps the woman to cover her sexual attributes. Moreover, it also helps men to consider the woman as a human being only, since he cannot see her body. On the one hand, it urges women to be committed to the morals of hijab which prevents the woman from sexual deviation, and which is the main reason behind donning the material hijab; while on the other hand, it considers the material hijab as a kind of protection that protects both man and woman from being affected by the situations that can have negative effect on their morals.
The material hijab demands that the woman should cover her entire body except the face and hands, and that she should not wear make-up whenever she goes out in public. However, what's happening in our societies is a very different situation. A lot of women wear figure-hugging clothes, that reveal the contours of their bodies in such a way that they turn on the sexual desires of men. Furthermore, some women do wear the hijab and yet practice the morals of whores. We see them with their faces fully made up; that draws attention while they also talk in a certain way like plastic dolls or aliens from an unknown planet.
In my opinion, this is not hijab. It is a partial sort of nudity that represents a direct sexual stimulant. It reminds man of sex in the way that she stimulates him to commit a sin. I am not talking about a closed society nor the Taliban, but let's be more logical and get back to our roots, our cultures and traditions. In the West there is an absolute freedom for both genders, and yet there are huge numbers of rape cases.
Hijab has a material side which involves covering of the body and a moral aspect that makes a woman act as a human being in society. I neither am a theologian or a social scientist nor am I a specialist in Islamic studies. I am just a ordinary man who has his own opinion.
To be fair enough, I cannot blame the woman for being a beautiful being that attracts man, but I blame some men for being animals. I do not deny the fact that men are a source of attraction to women just as women are to men. Dear woman; what you put on your head is not just a scarf nor is it a religious or traditional obligation. It's a way of life. Now I would like to say a final word. For some men a woman is like a diamond. Would you expose your diamond to the public rather than keeping it in a safe? Which is more exposed for public usage? Is it a private car or a roaming taxi?