I am one ...most of my family and relatives have survived this. My cult abusers, handlers, and programmers were themselves victims, and most of them were not even related to me.
I know over a hundred victims personally, and have heard the testimonies of hundreds more. The victims are all over the world, in most every town. Countless victims don't live to speak for themselves.
I couldn't possibly give a more exact answer. I'm not God. If it bothers you to consider these things happen, pass it up.
But you don't need to go on my word. Biblically, a Christian celebrating halloween is wrong. The Word says to avoid even the appearance of evil.
1 Thessalonians 5:22
[22]Abstain from all appearance of evil.
Jeremiah 10:2
[2]Thus saith the LORD, Learn not the way of the heathen, and be not dismayed at the signs of heaven; for the heathen are dismayed at them.
1 John 2:15-17
[15]Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him.
[16]For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
[17]And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.
2 Corinthians 6:17-18
[17]Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you,
[18]And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.