Question: Why G-d had to confuse people's languages in the land of Shinar and scatter them across the Earth with diverse languages? What moral does Genesis 11:5–8 coveny to mankind execept the fact that "in order to initate a huge project and achieve its result, there should be no communication gap". And if this was good then why God scattered them?

It seems that Genesis 11:5–8 is revealing as if God was helpless and was left with only one option i.e. confusing people's tongue and not letting them understand each other.
Had there been just one language, may it be Hebrew or Arabic or any other language mankind used to speak then mankind would have been living peacefully and prosperously.
Why would it be not acceptable to God?

Please explain with clarity. Thanks

Answer: 
The way you've written your question shows that you haven't interpreted the text correctly.

[Genesis 11:6-7](http://en.wikisource.org/wiki/Tanakh/Torah/Bereishit/Chapter_11) reads:

> 
> And the Lord said: 'Behold, they are one people, and they have all one language; and this is what they begin to do; and now nothing will be withholden from them, which they purpose to do.
> 
> 
> Come, let us go down, and there confound their language, that they may not understand one another's speech.'
> 
> 
> 

The answer to your question is that this was intended to break up the project by preventing the people from communicating with each other.

The assumption that the project was good is not necessarily correct. [Wikipedia](http://en.wikipedia.org/wiki/Tower_of_Babel#Themes) says:

> 
> The first century Jewish interpretation found in Flavius Josephus explains the construction of the tower as a hubristic act of defiance against God ordered by the arrogant tyrant Nimrod.
> 
> 
> 

From a mythological standpoint, the story of the Tower of Babel can be seen as an explanation for the diversity of languages spoken by people around the world.
I believe that what these people were after is to "build a name for them selves" apart from God, or as someone here said, in defiance of Him.

So the question is not if God was helpless, the point is that they were alienated, as godless men ever since Adam's sin are, and as such they commited to "reach the sky".

And since even the ability to communicate in unity & harmony is really a blessing
from God, He did not need to do anything agressive to disperse them.

He simply withdrew His own blessing, which is inherent to Him and to those He favours.

Because He wishes to bestow blessings thru communion with Him, 
not outside of it.