@tsarstepan,
Not necessarily, I don't see a reason why people would boycott seeing this film just because of a random tragic event was connected with it.
It'd be like never flying again after 9/11 logic.
There will always be psychopaths that ruins people's day, it doesn't mean we have to live in fear, and playing the blame game gets boring after a while. Put the psycho behind bars, comfort the family of victims, show strength of humanity and bravery to others by the lives of the survivors, and try to make tomorrow a better world.