What Is Going On?

I read the movie studios are canceling premieres and showings of Jack Reacher and Django Unchained.  Why?  What does this have to do with the Newtown shooting?  Is the idea that violent movies are insensitive in a time of crisis?  I just don't quite get the logic.

I realize all my comments about the Newtown shooting must come across as terribly insensitive.  I guess not being on the East Coast and not having little children somehow distances me from feeling the true horror of the spree shooting.  But the senselessness of these types of things leave me feeling unchanged and not as if we should stop living how we live.  There are crazy people who will do horrible things now and again.  That's about all I can take away.