Re: light a candle in memory of victims or Ruju’ ilal-Allah ?
Exactly. Lighting and burning fire was a custom in all the cultures to keep ferocious animals away. It was a symbol for finding way / guidance in old times. Remember story of Musa (AS) in Quran:
When he saw a fire and said to his family, “Stay here; indeed, I have perceived a fire; perhaps I can bring you a torch or find at the fire some guidance.”
20:10