From my own experience, I can tell a funeral is never a mood boost. It ends the period between death and becoming aware this person really died by making it absolutely sure this person is no more. Grief and sorrow stays and takes time to go away. If the dead person suffered and death was a release, you are relieved, but never happy.
There are already boosts and debuffs for the death of rivals or friends - a funeral doesn't need to add more.
There are already boosts and debuffs for the death of rivals or friends - a funeral doesn't need to add more.