I am by no means trying to show disrespect but events like this occur quite frequently around the world. What about the genocide in the Middle East and Africa? We have no such monuments representing those lost there. It is a tragedy, there's no doubt about that for sure and may those affected by the disaster find peace soon.

Player held funerals, IMO, are the correct way to handle such situations. In terms of lore and game world, having a Leviathan or Titan shrine would be almost heathenistic as the Primals are contradictory towards to Twelve. And considering the relationship between the beast tribes and the Primals, having players in direct contact with the primals is a bad idea.