Some are using the Daesh terror attack against Brussels to push their own agendas. One of the agendas is Muslimophobia*. Another is Trumpism. Still another is blaming the EU for allowing in Middle Eastern refugees—aka, victim shaming—and still another is xenophobia and racism**.
Now is the time to simply comfort, console, grieve with, and support the Belgians—just like my role at a Normative (i.e., Non-Messianic) Jewish funeral would be to comfort fellow mourners among Tzion v'Yerushalayim, not ask "Do you know Yeshua?" or "Did [the decedent] know Yeshua?" or "Since [the decedent] died without knowing Yeshua, [he or she] is not in Heaven. Would you like to know how to stay out of Hell and avoid [the decedent]'s fate?"
Those who incite Muslimophobia, use Belgium's 9/11 to promote Donald Trump, or engage in shaming the Belgians and stereotyping are no better than, e.g., Jesus For Jesus under opportunistic and Holocaust-exploiting David Brickner or people whom go onto the comments section of "Times of Israel" articles about murder victims to proselytize—whom would similar to me were I to start giving the whole "Let me tell you about Yeshua" schpiel at, e.g., an Orthodox Jewish funeral (which is akin to what has happened in "Times of Israel" comments sections, with one incident in which a friend of a decedent's family friend had to get involved and ask people to refrain from proselytizing).
*Note that I did not say "Islamophobia". I grant that moderate Muslims are really Reform/Liberal/secular Mohammedans—and Jews in Poland were called "Mosaics", similarly and by the way; so, with all due respect, get over your political correctness. By the way, you could call Daesh, Al Qadea, etc. Orthodox Mohammedans or Ultra-Orthodox Mohammedans, since Mohammed was a violent man. By alienating Reform/Liberal/Secular Mohammedans ("moderate Muslims") are you going to help fight against Orthodox Mohammedism and Ultra-Orthodox Mohammedism?