Baha’u’llah said that all the nations need to come together and to consult on how to establish peace.
"..... The unity of the human race, as envisaged by Bahá’u’lláh, implies the establishment of a world commonwealth in which all nations, races, creeds and classes are closely and permanently united, and in which the autonomy of its state members and the personal freedom and initiative of the individuals that compose them are definitely and completely safeguarded.
Let's not worry about all the nations of the world... let's just talk about how you could make it work in a country that is sort of already united and sort of at peace with itself, the United States. The two major parties don't agree on very much and can't seem to be able to work together. Now apply the Baha'i plan to the U.S.
One side wants semi-automatic weapons to be easily accessible. The other wants to ban them. One side is against abortion. The other wants it. One side says the other side cheated on the last presidential election and tried to use force to keep the winning side from taking control. Who was right? Who were the cheaters and the liars? Who would the member state rise up against and stop? Each state has people from both sides.
If the Baha'i plan depends on a majority of the people, then would does that majority do if the minority doesn't want to agree to the terms and wants to fight? What happens in the Baha'i plan if the majority wants abortion to be a right, but the minority says that it is wrong, and it is taking the life of an unborn human?
Yes, I'm so doubtful. And no, Baha'is don't go into the details. And like with the Baha'i stand on homosexuality, when they do, they raise the concern of a lot of people that do not agree with what the Baha'is believe.
Now one answer would be... apply what Baha'is claim to be God's laws. Anybody disagreeing with God's laws would then be wrong. And if those people rebel and fight, what would be the Baha'i solution? In the U.S. we had that situation with prohibition. The "Godly" thing to do would be to ban all alcoholic beverages.
And Baha'is agree, they say God's law ban alcohol. Yet, when the U.S. tried to enforce such a law, well-armed people rose up and fought against the government's authorities, the police and FBI.
So, in a world where God's law prevails, what would Baha'is recommend for a solution to those that would produce and distribute alcohol? And what would the Baha'is do if the majority wanted alcoholic beverages and didn't want to follow God's law? Let the majority have their way? Since you know drinking goes along very well with other vices, like sexual promiscuity, gambling, drunkenness and people willing to drink could also want to do recreational drugs. In a peaceful, united world can we have such things go on and for them to be legal?
So, take my doubts away. Show me the Baha'i plan can fix all those things.