If the USA and Europe didn't support the Settlers they would take actions to stop them. They do not. They yammer, they hem, and haw, and prattle. But the DO NOTHING. And nothing is a far more persuasive argument than all the blabber in the world.
Labor court orders Jerusalem light rail operators to return to work (Haaretz)
from the article: Can a U.S.-Israel deal on settlements stop the settlers?