In apologetics, there's an argument for God's existence called the moral argument. It basically says that if atheism is true, moral values can't be objectively true. They can't be facts. If there indeed are objective moral facts, such as rape and racism being evil while peace and compassion being good, atheism has a problem.
The usage of the term "social justice" triggered something within mainly American readers. The claim that it's a code word for socialism implies that I'm a socialist who try to sneak in some evil Marxism into the church. This is, of course, ridiculous.
Pentecostal activism for peace and justice is not only possible - it's already what the Holy Spirit prefers to do.