Karma or Indifference?

El asci1n0 de mí hermana died, and I don't feel bad at all. A couple of years

ago, a group of boys murdered my little sister. A year later,

they stole a car, crashed it, and three of them died. The other day,

I stumbled upon the grave of the main guy who did it. I told my friend

I see it as karma. She said I can’t hold a grudge against a dead 17-year-old and made me feel

like a bad person. But I'm not holding a grudge. I'm just numb. What am I supposed

to feel? Am I wrong for not feeling sympathy?