Muslims have staged deadly riots over stupid things way before Denmark ever became this year's target of flag-burning.
(All of these articles are taken from The Palestine Post archives.)
In 1934, Muslims started rioting over a book that supposedly insulted Mohammed:
A very similar case happened a year later. A Hindu wrote a book, allegedly insulting Mohammed. He was promptly murdered. When his killer was executed, the Muslims in India rioted, killing 20:
In Lahore, some Sikhs decided to demolish an abandoned mosque. Only four were killed, so this was considered a very minor riot.
Again, a similar scenario played out in 1936 in Bombay when the Muslims felt that a Hindu temple was being built too close to their mosque:
They also show that the much lauded "Muslim tolerance" towards other religions is a myth, and has been for quite some time.