Here is the verse which is understood as the decree of veil on Muslims, Surah 33, verse 59
"O prophet,tell your wives and your daughters and the women of the believers to bring down over themselves part of their outer garments. That is more suitable that they will be known and not abused. And ever is Allah forgiving and Merciful."
First even if we take this verse at face value,the decree includes wives,daughters of the prophet, and wives of Muslims. Then enforcing wearing the veil on children is unjustified.
Second, Let us explain it in context. Everyone living in harsh environment needed a head covering.There were slaves who were not allowed to have head covering. People abused women on the street without head covering, the verse clearly states that the wisdom behind wearing the veil is to protect the women by identifying them as free Muslims women ( not slaves). The day slavery was abolished, wearing the veil should have become absolete.
Third, Following the wisdom of the decree of Koran, Muslims women who live in the west should NOT wear the veil for their protection.
Once again Muslims scholars who are mostly men are not seeking ways to liberate women from an old tradition which has nothing to do with Koran.