TNG was the one to start the "you need to be like us (America)" stuff that runs throughout modern Trek.
Also -- and related -- the "one world Utopia" may sound all liberal huggy-feely, but as presented in TNG it meant the homogenization of humanity under one single culture where individual differences in personality were almost non-existent. Everyone marched to the same fucking drum.
There's no way to pull that off in reality that isn't fascist.