Why do Muslim followers of Islam want to attack, kill and injure innocent civilians in western countries like England?

What is influencing and inspiring Muslims to attack, kill and injure innocent civilians in so many countries around the world?

What are those Muslims tying to accomplish? What is their mandate and goal?

Does it have something to do with Islam, the hadiths and the verses in the Qur'an that call for the destruction of Jews, Christians and non believers?

Are they simply following their religion?