Note: There is exactly zero religion involved in honor killings; this is a 100% cultural act. Here are some choice quotes from Wikipedia:

Honor killings are primarily associated with the Middle East, the Maghreb and the Indian subcontinent, but they are also rooted in other societies, such as the Philippines, Northern Caucasus, Latin America, East Africa, and historically in Mediterranean Europe.

In French culture, stories about such homicides were romanticized and featured prominently in French literature of the 19th century, and "In literature as in life, unconventional women needed to be severely punished lest their defiant attitudes inspire further acts of rebellion".[33] In Corsica, there was a strong custom of vendetta, which required Corsicans to murder anyone who wronged their family honor. Between 1821 and 1852 approximately 4,300 vendetta killings were perpetrated in Corsica.[34] France also had a strong culture of dueling meant to uphold honor, and France was called by the National Geographic "the dueling capital of Europe".[35]

Though it may seem in a modern context that honor killings are tied to certain religious traditions, the data does not support this claim.[95][93] Research in Jordan found that teenagers who strongly endorsed honor killings in fact did not come from more religious households than teens who rejected it.[93] The ideology of honor is a cultural phenomenon that does not appear to be related to religion, be it Middle Eastern or Western countries, and honor killings likely have a long history in human societies which predate many modern religions.[96] In the US, a rural trend known as the "small-town effect" exhibits elevated incidents of argument-related homicides among white males, particularly in honor-oriented states in the South and the West, where everyone "knows your name and knows your shame." This is similarly observed in rural areas in other parts of the world.

Provocation in English law and related laws on adultery in English law, as well as Article 324 of the French penal code of 1810 were legal concepts which allowed for reduced punishment for the murder committed by a husband against his wife and her lover if the husband had caught them in the act of adultery.[101] On 7 November 1975, Law no. 617/75 Article 17 repealed the 1810 French Penal Code Article 324. The 1810 penal code Article 324 passed by Napoleon was copied by Middle Eastern Arab countries. It inspired Jordan's Article 340 which permitted the murder of a wife and her lover if caught in the act at the hands of her husband (today the article provides for mitigating circumstances).[102] France's 1810 Penal Code Article 324 also inspired the 1858 Ottoman Penal Code's Article 188, both the French Article 324 and Ottoman article 188 were drawn on to create Jordan's Article 340 which was retained even after a 1944 revision of Jordan's laws which did not touch public conduct and family law;[103][104][105] article 340 still applies to this day in a modified form.[102] France's Mandate over Lebanon resulted in its penal code being imposed there in 1943–1944, with the French-inspired Lebanese law for adultery allowing the mere accusation of adultery against women resulting in a maximum punishment of two years in prison while men have to be caught in the act and not merely accused, and are punished with only one year in prison.

-Wikipedia

So yeah, this is a big problem in many parts of the world and if your reaction to innocent women losing their lives is to make a tired and irrelevant point, then please don't.