Maybe try reframe the topic to "Men being beheaded in Mpeketoni Lamu?"
With majority of the farmers in Lamu being Kikuyu, chances of a Kikuyu farmer being killed in a terrorist attack is very high than a Luo farmer in Lamu. Why mention the ethnicity of the farmers being murdered? Do you have proof that the murderers are specifiacally singling out only Kikuyu farmers and not just farmers that do not originate from the coastal region?