why was monica's father insensitive to robyn hours after the shooting?

sorry if i'm posting in the wrong area. i've never posted before on a forum. anyways hours after the shooting monica’s father drove the girls [robyn and friends] home. at one point, he asked robyn, “how does it feel to go to prom with a killer?” robyn didn’t react much to his question. i'm confused about how he could ask robyn that just 3 hours after a tragedy. does this come off like monica's dad suspected robyn of being involved or what? am i over thinking that statement?

I assume it was because so many people were shocked and angry over it. But I think Monica might’ve been friends with them too. So I’m not sure why the aggression towards Robyn .

Unless Monica’s dad spoke to her privately?