OT-Rottweiller- Advice,Turns out their pit bulls. I'm Tupid.

Anyone here own one or know anyone who owns one? My little sister has two of them, and I'm worried sick. She says if you treat them well, they won't hurt you. Still, I worry. She keeps them outside in a fenced area, but sometimes lets them roam free. I worry about her getting attacked or them attacking someone else. I'm petrified of them and I refuse to even go to her house because of them. My mother won' t leave her car when she visits.
I'm sure in some instances they can be good dogs, but I feel like you'd really need to know what you're doing. I don't feel she knows what the heck she's doing!
Are they really as bad as the media makes them out to be? Am I worried for nothing?
Just found out their PITBULLS. ROTFL. I knew that, but got the ROTWEILLER STUCK IN my head. Either way, I'm still scared for her.
I'm sure in some instances they can be good dogs, but I feel like you'd really need to know what you're doing. I don't feel she knows what the heck she's doing!
Are they really as bad as the media makes them out to be? Am I worried for nothing?
Just found out their PITBULLS. ROTFL. I knew that, but got the ROTWEILLER STUCK IN my head. Either way, I'm still scared for her.