In Islam saving one life is like if you save all.
In Islam killing one life is like if you kill all.
Islam encourages to live in peace and not kill for no reason, and before attacking Islam (for a specific type of people) please read the following:
1. Extraordinary Value of Human Life in The Qur`an
By: Dr. Ahmad Shafaat
http://islamicperspectives.com/tafsirofsurah5_32.html (This is only one page)
2. http://www.questionsonislam.com/aboutus