There are different flavors to the unity. If you say that you are living in a society with different sects so behave nicely. That's fine. But when you start compromising on your beliefs then that would be a problem. That is not unity but surrendering to other sects due to inferiority complex and this is the most common form of unity propagated by some shi'as today. For eg. One guy with an amamah on his head says from Minbar, let us open our fast 5 mins early with sunnis to strengthen unity with them. This would not be an issue to sunnis but it will definitely break our fast (haraam and kafarrah). Some other people think we should not do Tabarrah either publicly or privately. We should be proud to be a Shi'a and not the one who surrenders to them along with our beliefs.
Please quote the ayah.
What do you mean by comprehensive unity?
There are some other points like Tabarrah doesn't involve cursing and tabbarah puts other shi'as in danger that I disagree but I'm not discussing as it would open too many topic for discussion at once.
Also, people are forgetting their deen, literature and Ahlulbayt (عليهم اسلام) for the so-called unity which is never possible to achieve. Followers of Omar killed shi'as yesterday and they will kill you today, no matter you curse or not. So it is better that movie should be used for propagating the haqq. The idea is very good.
I'm not supporting or opposing the movie in any post. I just pointed out that you are trying to portray as if Sayed Ali Sistani forbade to watch Lady of heaven, which he hasn't till now. Don't beat around the bush, if you have specific fatwa then post otherwise don't attribute something to him he hasn't said.
I know about sayed Khamenei but Sayed Ali Sistani does not have any fatwa on the movie. Don't pick up his old fatwa and make conjecture and deviate people.
If he has given direct fatwa on this movie, please post along with link to his website.