Don’t give up doing Halloween or any other holiday. We all lose if you do.
Take this as an opportunity to teach everyone from the scum who took your decorations to your daughter who misses them, that you will never give up on something you enjoy because of the nastiness of others.
This won’t be the last time your daughter will be disappointed or hurt by the actions of others, but this could be the beginning of her learning how to deal with such situations through strength and grace.
Wishing you all the best.