Kroenen77 The Tusken chief explains that there are many tribes, some of them who kill, others like theirs who hide to survive. The tribe who took Shmi seems to have been of the former, and we also don’t know why they took her and what they truly did to her other than it eventually leading to her death.
I don’t really have any feeling a about Cammie and Fixer, because if you don’t know who they are then it doesn’t matter they’re just more civilians being harassed by the gang. If you are in the know then it’s a cameo of minimal impact.