Yes, I know that's not what Puccini called for, and not exactly what the music suggests. But I wonder if people miss the candles and crucifix because they want to believe that Tosca is a good religious, moral girl at heart, even if she's living in sin with her boyfriend, betrays his trust (the location of the escaped prisoner), and commits murder. Well, maybe she's not so pure and simple after all. Maybe her first thought is not religion and expiation, but just how to survive the whole messy business with her life and lover intact. Or maybe she can't even think straight at all about anything, and essentially zones out, as if not even really conscious. All plausible, it seems to me.