On one hand, they do have a point. On the other, they're going about it in the most sanctimonious, offensive, and heavy-handed way possible.
People are murdered literally every single day in Middle Eastern and African countries. ISIS, Boko Haram, and other terrorist groups commit atrocities weekly. It's horrific and completely unacceptable. But... at the same time, us Westerners have become desensitized to it. So many places in Africa and the Middle East are complete shitholes so, in an awful way, we kind of expect things to happen there. It's not very shocking to hear that Boko Haram sent a suicide bomber to a busy marketplace and caused the deaths of 25 people, because it happens all the time.
But Paris is the heart of one of the most democratic, free, and peaceful countries in the world. Things like this don't happen in Paris. They happen in places like Kenya, Syria, Lebanon, and Palestine. So when 130 people are brutally murdered by jihadis in Paris, other Westerners tend to pay a lot of attention. Plus, they were murdered while enjoying the pleasures we take for granted in our safe, free societies everyday; when you hear about people being shot to death while eating at a cafe, attending a concert, or taking a walk, that tends to strike a nerve because we can immediately imagine what it must have been like.
Also, the incident in Lebanon had the misfortune of happening so soon before the Paris attacks. I'm sure it would have gotten more attention otherwise.
And like Raymond said, it's just human nature to sympathize with and support our own kind over others. The French- who share many of our cultural, religious, and political values- are easier for us to empathize with than people who live in societies that are completely foreign to us.