(This image came from https://healthculturesociety.wikispaces.com/Ignorance,+or+cultural+misunderstanding%3F.)
Now, this is mainly a political blog (sometime I'll get into prepping/survivalism, weapons, and things like that) and not a fashion one, but due to the socio-political connotations of hijab and the lack of understanding between cultures, this counts.
If you're interested as to which faith I practice, scroll down.
What I think of hijab; I personally believe that it is beautiful, but I do not actively support it. While you can look up the advantages of it, I do not believe that there should be any laws whatsoever regarding it (with an exemption of facial coverings and the use of force/pressure/coercion regarding wearing it).
Speaking of coercion and pressure, I'd like to mention a meme out there that says "Girls without hijab are hot. Girls with hijab are beautiful" (I will not show it here), and I personally disagree with the way the message is conveyed. To me, that is simply too harsh (being sent to hell simply for exposing too much of your body), and thus, inappropriate for promoting what you want. I mean, really? Going to hell (pardon my language) simply for being a female and not covering your head? Why not make memes to Islamists warning them to stop doing crap (such as attacking civilians, implementing fundamentalism and so on) or suffer the same fate?
Now. I do NOT promote hijab, but I do not oppose it either. I recommend reading http://www.djiboutijones.com/2012/05/hijab-and-bikinis-sexy-oppressive/ , and I like the article because, to me, it actually gives a more balanced point of view than most others. Happyness is extremely subjective.
Simply put, I don't think that this is the time or place to wear facial coverings outside of places where it is socially acceptable.
The best way that I could come up with to describe this to you and to add a bit of comedy, "What is if a bunch of nudists came to, say, Mecca and started being inconsiderate of the culture there?" (don't worry, the video is "clean"). I feel that this is comparable to what niquabi/burquabi people are doing outside of countries where their behaviour is acceptable.