First, it's factually inapposite, because we don't have a bunch of disproportionately pro-Saudi American companies and billionaires trying to intimidate people speaking in favor of Yemeni civilians, considering ad blitzes to gaslight and obfuscate the issues, etc. We don't have a significant pro-Saudi bias in the media such that it views the conflict there as worthy of constant reporting and also as a relatively black-and-white struggle where Yemeni civilians either are getting what they deserve or are merely unfortunate collateral damage for justifiable military actions. We don't have a strong contingency of people in this country trying to act like speaking out against the killing of Yemeni civilians is being "pro-terrorist".
Second, it's logically inane to say that someone's criticism of something is invalid because they didn't speak out or criticize some other thing that they most likely don't even know about.