They get the Neutrality doctrinal policy wrong. While Jesus said that they were to be no part of the world, they lost the context of this.
There had been prophesies of the messiah from back to Moses' time, then Isaiah, Daniel and others.
They recognized Jesus as the Messiah but they expected him to free Israel from the Romans like Israel was freed from Babylon. That is why in Acts 1:6 they asked him: “Lord, are you restoring the kingdom to Israel at this time?"
Jesus didn't say Yes or no but he told them that their job would be to preach him in the world.
The land of Israel had no more use to God. Christians didn't need a land as their kingdom was heavenly.
Being no part of the world meant not to put their allegiances in the world, but it didn't mean hands off on what is going on. While it mean that we are to have love for our brothers and the people it does not mean that when our neighborhoods are attacked, we just don't do anything.