In my opinion? Rose is both good and bad, like all the characters on the show. That’s why I love Steven Universe so much… You can see a character like Rose, and see all the good things she did, and how much she changed (especially near the end of her life with Greg), HOWEVER… You can also see that she was very flawed, and made a lot of selfish mistakes, including throwing some of her loved ones under the bus. She did a lot of awful things, and a lot of good things, just like any of us.
So yeah, I do feel pity for her. It’s not like she didn’t try to talk to the Diamonds, and change things the peaceful way (much like Steven now). It’s very sad to think, if they had just given her the time of day, and attempted to question their own faults, how many lives could have been saved? That’s pretty damn sad.