I say the reason is that Muslims are taught from birth that there is only 1 religion, Islam, all other religions are an insult to Allah and must be destroyed. It's the Muslim exceptionalism, Muslims are superior to other religions and peoples and can do whatever they want to see that Islam dominates the world.
source: http://townhall.com/tipsheet/greghengler/2011/04/04/matthews_why_do_muslims_blow_up_a_buddha_statue_but_kill_when_koran_is_burned