By excommunicating these American Jewish "doves", you will just make religious victims out of them. One of the great strengths of the Jewish people is their tolerance of others viewpoints, and their willingness to endlessly debate/discuss without resorting to violence. Just look at Israel itself. The most conservative Jews there won't even fight to defend the state, yet no one is saying excommunicate them? If Israel starts targeting dovish Jews in the USA, it will just increase their legitimacy, possibly alienate and accentuate divisions within the Jewish community, and give the doves more media exposure. Best course of action: try and convince them of the logic of your position without giving them the spotlight and attention they crave.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Dovish Jews? They love Israel? Excommunicate them