I don’t think you’re supposed to root for the Maul-collaborating terrorists. I’d even argue Bo-Katan gets too much of a free pass, given her actions when she was part of Death Watch.
The problem is that the good guys are overly idealistic holier-than-thou idiots. It’s hard for me to root for such naivety. So the way I see it, Satine got what was coming to her.