why, why and why?

Why, why and why?

I really wonder why the Muslims in many parts of the world are so provokingly angry with so many things in this world. Its normal if people are angry with their governments because they are unhappy with the governing groups of people who are clearly corrupt, talking down to the people as though the people are all so stupid. They presume that they know everything. Huge crowds of Muslims yesterday marched to the House of Parliament asking the Government to step down because they are known to being corrupt. The Sunni Muslims have been killing the Shiah Muslims recently. While the Shiah Muslims in Syria are killing the sunni muslims. The Muslim rebels are going to be hunted by their government helped by the French troops. There are things happening in Algeria.

Why are they not reflective of Islam, which is a religion of peace. It is clearly stated in the book that Muslim cannot be on the offensive against the non muslims, what more against fellow muslims. Why?
Dont they read the Al Quran? Why? Don't they know that Allah in His Book says that all muslims are brothers and sisters to one another?

This behaviour could confuse the non muslims and they easily can say that Islam is a religion full of in fighting, hatred, revenge and greed.These are all behaviours which Allah Says Muslims should never be.

Obviously more and more muslims are straying from Allah straight Path!