The photo Manipulation is unethical because it's taking things and turning them into things that they are not. One of the best examples is the cabinet picture, where they took out the two women and replaced them with men. This is sexist and will offend many people. Even if something goes wrong, it's best to have the truth.
This is the most unethical because it is changing the person's whole identity. It is portraying him as something he is not. Although he has a dark life, he is still a person and should be pictured as such. It also makes Time look racist.
This is definitely the least unethical, because they took out a post and lightened the image. The post did not have any huge significance on the scene, and the lighter image would just be a typical editing thing.