but it's not really what's happening here. If a gun manufacturer sells you a gun where it is legal to sell gun, then they are neither doing something illegal, n

but it's not really what's happening here. If a gun manufacturer sells you a gun where it is legal to sell gun, then they are neither doing something illegal, nor directly giving you tools to do something illegal. They can't control what you will do with the gun, but they also don't tell you where it's safe to go kill people with it, and mostly give you safety instructions. Here it is the same thing with Facebook. If they sell you a platform for advertising, they might not be able to control 100% of the content of the ads, some bad stuff might slip. But they should NOT offer you tools to publish illegal ads. In that case, being able to filter ads by race is illegal, and it's on them to offer this option. It would be a different story if there was no option and a publisher just wrote "no people of <race>".