Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody. (Rom. 12:17, NIV)
Sounds to me like an argument could be made from this scripture reference that America's war is un-Christian, and that being a good Christian means being PC.
When you read the Bible you need to consider what instruction is given to governments and what instruction is given to individuals. The government has a G-d given responsibility to secure the peaceful life of its people. Individuals have a G-d given responsibility to reach out to other individuals in the name of Jesus. The first verse to which you refer was given to individuals.
As for doing what appears right to everybody (a pretty bad translation), Christians are supposed to be sensitive to others so they should be willing to be PC where such sensitivity actually speaks to the needs and concerns of others. However, much of today's PC isn't about the needs and concerns of others, it's about political power. Christians are to focus on the real, not the artificial.
It is much easier to understand the Bible if you know the author. Do you know Him?
Shalom.
Strange, isn't it, that the people who are trying to drive God out of school and government are the PC crowd?