Wearing the hijab (and modesty in general) is definitely an obligation amongst Muslim women. Ofcourse there are many cases, such as the sisters here (mystical moon & zaira), where one's family would not allow you to practice such aspects of religion.
But, in regard to the original post the excuse I find disheartening is not necessarily about intentions, but rather, hearing "Islam does not require me to wear it" or "Nowhere in the Quran does it say I need to wear it".
Its as though they're stating that the millions of Muslim women who already wear the hijab/niqaab are totally wrong in doing so, and only their (singular) opinion is correct. I just feel like if you don't agree in wearing a hijab, that's okay & should be between you & Allah, but why try to justify it under the Deen?
Some of these Muslim women even have the audacity to appear in the media and express these ideas, which will only divide the ummah. It's also very hurtful to those who already wear. The last thing we need is discouragement. Has anyone here seen that interview with the 3 Muslim women, one with hijab, one with niqaab and one with neither? Watch it & you'll see what I mean :-(
The benefits of hijab are immense, however the one benefitting the most out of it is the woman wearing.