TV Movie?
Just to mix things up, let me ask this:
Did this film start out life as a TV movie and then get elevated to feature film status by the infusion of a few extra dollars?
The entire production -from script to cast to direction- has the look and feel of a made-for-TV movie. To my mind this may be why it never got a US theatrical release. The subject matter would hardly have been so controversial as to prevent a theatrical release when plenty of films dating as far back as the 50's dealt with racial issues even more directly. Even ROOTS was more daring.
I also am aware that a great many US TV movies did get theatrical releases in Europe and elsewhere.
However I can see that very few US audiences would pay money to see a TV movie in a theatre.
The Cast is pure TV movie casting. The script is vintage TV movie fodder. The sets and production design is something out of a Hollywood backlot and the cinematography is unmistakably TV movie.
My thought is that the film had been put into production and was about to start filming when somebody at the front office said to go ahead and make it a feature film, so they threw in a few cuss words (mild ones) added one scene of -almost- graphic violence and letterboxed it.
Otherwise it is a TV movie to its very core.
"If you don't know the answer -change the question."