Am I right for feeling mad about this?

Thea • October baby coming soon ❤️🎃

Back story, I use to hang out with this guy about 4 years ago and since then he’s became a huge druggie.

Recently he killed his 2 step-brothers. In his own words because “he wanted to know how it felt to kill someone”

His girlfriend posted this on her Facebook.

Also, his mom has been trying to defend her son whenever someone makes a comment on his actions and even started a page in memory of her son (the killer)

I’m annoyed about his girlfriend (and his mom) posting pictures of him smiling & she has other post about missing him and wishing he was here and it pisses me off because he’s not the one who got murdered... do I have a right to be mad about this?