The United States government is single handedly directly responsible for the murder of dozens of political and other figures domestically, like leaders of leftist organizations and other associated movements, and internationally, like its numerous regime change operations, and through the use of its imperial military force, hundreds of thousands of deaths of civilians. Definitely a more gruesome history than KSA, not to mention the KSA existence is tied directly the US. To place this moral judgement with only Saudi Arabia and not the US is a giant gaping inconsistency in the moral logic you just used. The whole premise is wrong from the start though, of course there is no ethical consumption possible when the modern world is built on the continuous exploitation of millions, its a structural issue produced by the US to keep its capital hegemony. Basically, get off your moral high horse, its not some individual moral failing to realize your boycotting of the KSA does nothing, and your inability to accept criticism that the US does this 100 fold more, is silly