Anti-Catholicism.
Halloween is actually like Christmas Eve. The night before a Christian holy day. It is the "Eve of All Saint's Day" or "All Hallows Eve" or "Halloween." Just like "hallowed be Thy name."
Pope Boniface IV created the festival of All Saints on May 13 in 609 or 610 (we are not sure which). It was moved to November 1 about 735.
But just like Mardi Gras (Fat Tuesday, the day before Ash Wednesday), Halloween has taken on a life of its own.
Christians including Catholics do not fear death, evil, or Satan. In Christ, we can laugh in the face of death.
From an email I received: Being a Christian is like being a pumpkin. God lifts you up, takes you in, and washes all the dirt off of you. He opens you up, touches you deep inside, and scoops out all the yucky stuff--including the seeds of doubt, hate, greed, etc. Then He carves you a new smiling face and puts His light inside you to shine for all the world to see.
With love in Christ.