Is it okay not to care

Today I was looking at my hometowns unsolved cases. Scrolling through I came across a face I recognized. She was a girl I used to be very close friends with as a teen we used to hang out at her house everyday after school. So the page described her death which was pretty bad. But for some reason. I couldn't feel any loss of her. Because all I could remember was her small frail mom who had some form of retardation. I remember her mom crying one day and her screaming and yelling to STFU and calling her mom a retard while the mom was standing in her room with the shower running saying she had a accident and just wanted a shower. I went to her and helped her shower, I helped her get dressed and brush her hair. And thought to myself how could anyone treat there mother this way. We were just teens but this was not cool to me. I felt so hurt because it was a pain I didn't understand. I went to my mom told her what happened and we called someone. I never wanted to be her friend again. So sadly I couldn't feel any pity for her. I felt truly sad knowing her mother died