I agree to a point but I tend to be in two minds about this in general. How many years have to have passed before it's acceptable to disturb (in this case) a 2 year old childs grave and take whatever you like the look of to put on display? Is there a reason the child and items could not (should not?) be respectfully re-interred once the items have been catalogued, photographed etc?Rummaging through a freshly covered over grave in the municipal cemetery in the hope of finding a few gold fillings is wrong. An archaeological dig with an aim to better understand the past is quite different surely.
Would it be morally wrong to dig up a Victorian grave yard and stick anything of value you find on display? How about a WWII cemetery? At what point do moral considerations expire in the name of looking at something shiny in a glass case?