There's nothing wrong with fighting to protect people it's the part where you decide you and your friends get to decide who is right and who is wrong.
As I said before, you don't know anything about me, so don't presume that you do so that you can justify your righteous indignationand buttress poorly formed beliefs. My family has a long history of military involvement, my grandfather fought from Normandy to Germany and suffered greatly for it. Two of his brothers fought and one didn't come back. My maternal grandmother was Osterbeiter and met my maternal grandfather in a German work camp. All of my family hated Nazis with a passion their entire lives, and half of them also hated Soviets. Don't talk to me like I don't understand fighting for what you believe, and don't tell me I don't understand suffering.
Military excursions in the name of ideology, particularly when they are done by a superpower, very quickly become imperialism. Thinking China is immune to that is immensely naive.