It seems like they did have permission to make the memorial. However they (the park service people) received a large number of complaints about it from people. So they took it down.
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Wouldn't it be nice if they had a permanent memorial? Like a monument at a grave. Too bad the people responsible are too concerned with other things. Re-watching the 1 year update & SP is more emotional about the missing kid while JM/A/whatever is concerned with defending herself.