They are all just books. They tell us stories about our ancestors, they teach us moral lessons, they discuss the relationship between a higher being and believers of that faith. We place a lot of importance on our respective Books, believing that through them we can achieve a greater sense of being and perhaps even salvation. The Koran, the Torah, the Bible, all may be just books, but because of our very personal faith, we expect others to treat our Books with respect.
It deeply saddens me that anyone would even think of defiling a religious object, a symbol of faith. The saddest part is that people in other countries have so little confidence in the US that they have no problem believing that someone in our army would do such a thing. It's like the bad rumor you hear about someone. If you respect that person, you say, "No way, that would never happen." But if you hate the person, then of course they did that bad thing. And so we punish our media for reporting information, but we don't punish the people who made the world hate us to begin with.