Hizab Controversy in Karnataka:
On February 5 the Karnataka Education Department has directed educational institutions in the State to follow the dress code decided by the college’s development board or, in case of no such dress code, “students can wear dress which will not affect equality, integrity and law and order”.
The hijab controversy started last month after some girl students of Udupi Government Pre-University College wearing hijab entered the college campus, who were not allowed to attend classes. The college authorities say that the girl students who used to come without hijab earlier have suddenly started coming in hijab.
The hizab protest was started by 10 girls claiming right to wear hijab while 75 other Muslim students followed the order on dress code. Politics erupted over the issue.
Now it turns out that all the students had at the time of admission signed consent forms to agree to abide by the rules of Uniforms. See this discussion:
So what made them changed their mind?
Actually the question is wrong. A true Muslim is bound by Taqlid. He or she is not supposed to deliberate or apply mind. Muslim has to obey the Imam or Emir-ul-momin which translates into Comander of Muslims.
According to the Zawziah Institute of Islamic Study:
“Scholars and linguists agree that the term taql•d has its etymology, its origin, in the Arabic word, qallada; which means: “To place a collar ( qilådah) around the neck.” The reason it is termed as such is that the one making taql•d – the muqallid – resigns his affair to the one he is performing taql•d of. Thus he is, so to speak, like someone being ‘led by the collar’.”
Even otherwise a girl is half a person as per holy Quran. Her testimony is of half value. Her inheritance is half. She is not permitted to enter mosque etc.
It is also there in reports that notorious Popular Front of India (PFI) and Jamayat-e-Islami has instigated these girls to insist of hizab inside class rooms.
The idea is create a distance between Muslims and non muslims. To show off the special identity. On top of it, play the victim card if denied.
It is not very different from maintenance of a distance from Kaafir (non-believer) and to keep trouble brewing for Kaafir Government by way of jihad or struggle to claim religious rights.
In any case, while Holy prophet had proclaimed that he was last prophet but now every Imam is virtually acting like prophet by making rules for the Muslims which did not exist earlier. Hizab is such rule.
Notice this picture:

This person in red tie, in the image is Al Hussein bin Abdullah II, King of Jordan with his Family who is the 41st Generation direct descendant of Prophet Mohammad.
Notice, no hijab.
But then they do not claim to be prophet like Imams and Ulema of India.
Here is extract from Holy Quran:
[8.12] When your Lord revealed to the angels: I am with you, therefore make firm those who believe. I will cast terror into the hearts of those who disbelieve. Therefore strike off their heads and strike off every fingertip of them.
[8.13] This is because they acted adversely to Allah and His Apostle; and whoever acts adversely to Allah and His Apostle– then surely Allah is severe in requiting (evil).