In every story told there is an implicit agreement made between the writer and his audience.
It’s a mental and emotional pinkie swear.
The audience willingly agrees to sacrifice realism, logic, and their critical faculties in order to enjoy the story being presented to them on the screen.
The writer makes a promise not to create story or plot or character elements that stretch that audience willingness too far.
If the writer breaks that unspoken pledge, the audience’s suspension of disbelief is gone.
And so, too, is your audience.
The movie still plays out. And the bodies may stay in their seats. But, the audience members’ hearts, souls, minds and emotions are elsewhere.
Their attention in the film is dead and gone.
Instead of engrossed in the story, they’re mentally making up their grocery list or deciding upon which X-box game to play when they get back home.