Wow - that is truly disturbing. My thoughts go out to anyone who knew them, and I hope the police can work out the motive for that attack.
I think, however, you should keep your display out this year, as the town's going to need all the levity / uplifting it can get.
Unless there's something in your display that might force people to think of this incident, I think keeping it up will help a little bit in keeping people's spirits up.
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