honour killings has nothing to do with islam its just cultural exceptions.like incest cases in west are very common we cant blame christianty for that.its acts of few that unfortunatly ppl try to portray as part of religion especially media.teachings of islam says
“…if any one slew a person - unless it be for murder or for spreading mischief in the land - it would be as if he slew the whole people: and if any one saved a life, it would be as if he saved the life of the whole people.”
the quran 5:32