> Assad has killed about half a million Syrians already in the civil war.
How can that be true? Western academics protest when so many people are killed. The Gaza health ministry itself claims less that 1/10 of that number, and look at how many protests and riots are in the US right now. If Syria really had half a million dead you'd see the academics rioting about that.
People typically protest their own government to effect policy changes. In the case of Gaza, the US is sending billions of dollars to Israel on a regular basis. The Syrian government, meanwhile, has been sanctioned for more than a decade by these western countries.