Read about Roger's early upbringing and you get a glimpse into what formed his anti war and political positions. His deep feelings about war and loss underlie his best music. The Wall and The Final Cut are strong statements that look deep into his wounds.
Roger uses his performances to provoke and reinforce the senselessness of war and the lifelong damage it has caused to millions. At the core of his statement is the fact that war is waged by political leaders and it is there that the senseless killing needs to stop. Agree with him or not, if you sign up for a live performance you will have his opinion delivered. If you put his music on your Hifi, he'll deliver it there too if you listen.