The problem is that you're presupposing that all the Tuskens behave this way or that even the entire tribe is like this. There might very well have been dissenters in the tribe that were overruled. The children in the tribe certainly don't have the mental competency to be held accountable either. At best, you can argue that all the adults in that particular tribe were responsible for Shmi's torture and death since they allowed it, but I don't think you can generalize that to Tuskens as a whole. I sympathize with Anakin because I think, emotionally, he lost control given the degree of trauma he experienced when his mother died and the visions he endured for a month. In honesty, I can't say I wouldn't do what he had done, even though I recognize that it was wrong. But that doesn't make what he did okay -- and Anakin himself recognizes that. Anakin doesn't have the right to act as judge, jury, and executioner. His actions are understandable to me on an emotional level, but I don't condone them on a moral/ethical level.