Cremation is certainly here to stay. And I do not doubt there are sound pastoral reasons for its use. However, the norms of the Church insist that cremated remains be treated with the same respect as the body. And just as we would not scatter body parts in the woods, or divide up limbs and torsos to distribute to family members, or put fingers into resin and wear them as earrings, neither should we do this with cremated remains. These ARE the remains of a human being and they are to be buried or placed in a mausoleum with the same respect due the uncremated body.
I think pastors are going to have to teach more explicitly on this matter and that bishops may need to issues norms that will help to prevent problems. One helpful norm might be to refuse to celebrate a funeral Mass until proper burial is scheduled. I am unclear if a pastor alone can do this, but surely a diocese must also have an increasingly firm and clear policy of which people are widely informed.
Simply permitting cremation without well-thought-out policies has proven to be a mistake. I pray that a post like this may provoke thought from all of us in the Church as to how to deal pastorally with a situation that is degrading quickly. We must do some teaching, but we also must not cooperate with bad practices.