Syria

I recently decided to rewatch Martin Smith's Frontline doc Bitter Rivals. I could not help but wonder while watching it why most Westerners slam the war in Yemen as a humanitarian catastrophe and as a frequent political pressure tactic to raise in Congress while the war in Syria is essentially ignored despite being an equal if not greater humanitarian catastrophe. What exactly is the logic behind this? Protests to end support for war in Yemen are all over the place but rarely does anyone hear protests to support for war in Syria. Yes the Saudis were/are reckless in Yemen, but no one in the ME is exactly an angel. I don't see the Saudis in Yemen as particularly more egregious than the likes of the Russians, Turks, Iranians, or the Americans elsewhere in the region as far as getting their hands dirty is concerned. Israel is a different story as they seem to get a free pass for doing the same kind of airstrikes as the Russians and Saudis but somehow it is viewed as a public service which is utter rubbish imo. Yemen is in a pretty dire state, but that could be said about a lot of places in the ME. There are places in Syria and Afghanistan that are arguably worse but neither of those wars seem to have the stigma attached to them as Yemen. Whenever Yemen is brought up in the west, it is viewed as a humanitarian catastrophe with frequent mentions about famine and desperation added for emotional effect. Afghanistan is basically thrown around as little more than a statistic these days, xyz number of people killed in another checkpoint blast, just another normal week in Kabul/Qanadahar/Mazar-e-Sharif. Where is the outrage? Syria is similar, people in west have become numb to Syria and basically these days it is completely ignored by everyone in the west except EU anti migrant crowd. Western suport for wars in Iraq/Afghan/Syria is commonly defended as being necessary with virtually no political consequences. Meanwhile being associated Yemen has become toxic and crrates extreme backlash, but why? What's so different about stigma that makes Yemen toxic compared to any other regional conflict like Syria or Afghanistan?