[ArrogantBustard]

I wonder how Catholics in the West will respond in such case?

In the past, we have done so by periodically exhuming old graves and placing old bones (if any are found) in an ossuarium. This practice dates at least to medieval times.

[NZerFromHK]

I think Catholic cemeteries in HK also have ossuaria - but it is an uncommon practice over there.