Christmas at the Cemetery

It seems that the more time I spend at the cemetery, the more I think about the "why." When I ask people about "why do you visit the cemetery? why do you decorate according to the season/holiday?" they do not have an answer or are unwilling to share it.
Are the living trying to keep the dead in the here and now?
Are the living still struggling to let go?
If a child died 7 years ago, at the age of 6, do you leave toys for a 6 years old or a 13 year old?
Am I just too dense to see what is going on?

The images speak for themselves.