Responses
that's the whole idea of how death note tips the belief of right and wrong. Both Light, L and nearly every important character of death note were morally grey. L did catch criminals yes, but he was still responsible for the death of multiple people, this is similar to the morality of near and Mello too. They all treated them like pieces of a puzzle that were no longer needed when they had died. Light had the right idea at the start, and then began getting swallowed up in his god complex which gave him a completely different reason to continue to kill the criminals.
Like light was actually good, he just wanted to stop crimes which he did, like he was a little crazy but that’s not the point here