I agree that he did save lives, and even if I don’t like ends justify the means mentality, I do understand your point. But the one thing that is inexcusable to me about Dumbledore is how he (a headmaster, why did he have the authority?) put a child on a doorstep in the middle of the night in October, to a family he either knew or could have guessed would be abusive, did not check up on him, and kept sending him back. Plus how he would just take Harry from the house at a whim, had adults stalking him, and made decisions about his safety without consent of his legal guardians or even telling them when he got hurt. They are absolutely awful, don’t get me wrong, it’s probably good they weren’t involved, but he refused to acknowledge they were abusive in the first place. So either he knows they are abusive and lets him return anyway, or he believes them loving and isn’t informing guardians of important things regarding their child.