Would you listen to the ex girlfriends side of the story if she said shit like thos

I've been with my boyfriend a year now. I just met his kids. He has an ex girlfriend who had tried on 3 different accounts to send me a follow request through Instagram. My boyfriend told me so not talk to her. She is a psychopath. I said okay. I recently got back into my Facebook and my messenger and saw a message request this girl sent me. My best friend said there are two sides to every story and maybe she had a reason to. Is there ever a reason to say this

My boyfriend and two of his sons have respiratory issues. I don't think there is ever an excuse to wish death on someone's kids. His baby mama has also said this girl is crazy. Would you listen to the side of someone who says things like this?