They are not expecting you to blindly believe them, but to consider their arguments, and decide by yourself. Right you are: Being Jewish is no garantee of knowing what is best, not for the Jewish people, as you wrote, but for the Jewish state, which is completely different. And that is also true for Netanyahu and his government.
FBI: Islamic State sympathizer charged in backpack bomb plot (AP)
from the article: U.S. official's criticism of Israel ambassador sparks furor