OK.
1-Agreed that what people call these days ‘honor killing’ has nothing to do with Islam.
2- Also, crime of passion or out of honor does have a lot to do with what we hear about honor killing. This is what I mentioned to be worldwide. If this involves one person or family member as accomplice, the idea in nut-shell is same. In countries where families mind their own business, cousins and other family members would be difficult to be found to be accomplice merely to commit a crime of passion.
3-When you mentioned about 80% number, and mentioned muslims from three countries, that is where the problem lied. Thanks for clarifying though.