In Game of Thrones season 6 episode 10, what was Cersei's motives for
burning Tommen's body and burying him at the place the Great Sept stood instead of entombing him beside his relatives? This is what Cersei says: "He should be with his grandfather. His Brother. His Sister. Burn him. Bury his ashes where the Sept once stood."
I read this as Cersei considering two options, but the reason for the decision is not clear to me. It could be:
Cersei felt Tommen was not worth to be entombed at Casterly Rock because it was a suicide.
Cersei wanted people to think Tommen was killed in the explosion. However, if people think Cersei was behind it, then they will think she knowingly killed him on purpose?
Cersei wanted to show tribute by burying him at the Great Sept