You shouldnt judge a religion because of some people in that religion, so lets say some other pple from other religion did what these guys did would u judge their religion ?
Let me put few reasons
The Qur'an never once speaks of Allah's love for non-Muslims, but it speaks of Allah's cruelty toward and hatred of non-Muslims more than 500 times.
Islam is the only religion that has to retain its membership by threatening to kill anyone who leaves. This is according to the example set by Muhammad.
Muhammad said in many places that he has been "ordered by Allah to fight men until they testify that there is no god but Allah and that Muhammad is his messenger." In the last nine years of his life, he ordered no less than 65 military campaigns to do exactly that.
Muhammad inspired his men to war with the basest of motives, using captured loot, sex and a gluttonous paradise as incentives. He beheaded captives, enslaved children and raped women captured in battle. Again, Muslims are told to emulate the example of Muhammad.
Now now , I have been living with muslims my whole my life , even my mother is muslim , I can assure you that Islam does not breed any hate and does not call on any violence.
You need to understand the verses of Quran and their context , they were mostly directed against the Kuraichi who were discriminating the muslims and constantly in war with them.
Also Islam was one of the first religion ( in the region at least ) , that set war and peace rules :
"Fight in the cause of God those who fight you, but do not transgress limits; for God loveth not transgressors. (The Noble Quran, 2:190)"
"But if the enemy incline towards peace, do thou (also) incline towards peace, and trust in God: for He is One that heareth and knoweth (all things). (The Noble Quran, 8:61)"
"God does not forbid you from showing kindness and dealing justly with those who have not fought you about religion and have not driven you out of your homes. God loves just dealers. (The Noble Quran, 60: 8 )"
"And what is [the matter] with you that you fight not in the cause of Allah and [for] the oppressed among men, women, and children who say, "Our Lord, take us out of this city of oppressive people and appoint for us from Yourself a protector and appoint for us from Yourself a helper?" 4:75 ( Al-nissaa)
"Again and again will those who disbelieve, wish that they had bowed (to God's will) in Islam. Leave them alone, to enjoy (the good things of this life) and to please themselves"(The Noble Quran, 15:2-3)"
Also many many verses , that I can't be arsed to mention here. Coptic egyptians have been living for ages under muslim rule , and both jewish and christian population have been better off under the Caliphate and the Umayyad than under the roman/byzantine rule. You should check the jewish history in Baghdad , and how they held great positions in the Islamic golden age.
Then again I'm not muslim , so I'm not blindly defending my religion , it's just that it is wrong to put have some prejudices based on what you hear in the media or from your environment , you have never lived with muslims and I can tell they are very friendly ( except the extremists of course , but that is the case of all religious nut heads in all religions ) .
Cheers.