Is it normal to think your mom deserves to be unhappy?

My mother constantly picks fights with her new fiancee and her kids. When she tries to talk to the kids about something she yells at them just like she did me when I was a kid. When you try to tell her something she just flips out on you like a fucking psycho. Like this 13 year old girl gave her sister the wrong pants. They were way to big and argued about it because their mom had picked the clothes out the night before. The 8 year old assures her they are too big and my mom wakes up, (we live in a motel room) and screams at the 13 year old while she is trying to tell my mother she got a new pair of pants for her already that do fit. But every time the 13 year old tries to say this she screams at her. The kid ends up crying because of it. Her fiancee wakes up and tells my mother to stop screaming and watch her tone when she speaks to her kids. My mom just goes on a rant and flips out for the next 2 hours. Still slamming doors and having an attitude. Says shit like "im done with these kids" and "i wish i could work tonight". I want to explode on her. This is why i don't love my mom, if she died right now i wouldn't care. I try to force myself to care but i don't. She is an idiot and an awful human being. She makes everyone around her miserable. She drives away her romantic partners and complains about her depression when they leave. But nobody feels bad. She has no connections with her family and because of that neither do i. Although her fathers side are rednecks and I can't stand them. She has no relatipnship with her sisters or nieces. They barely ever see her. She is gonna drive her fiancee away and me. And I really hope she ends her life. Is this normal? Is this bad?