One of the ways we judge people is by their ethics. Groups can have ethics, as well, and Islam has a full ethical system which all Muslims are to follow.
One of the key features of Islamic ethics is that Islam does not have a Golden Rule. Now Muslims say that Islam has a Golden Rule, but upon inspection Muslims have one set of rules for believers and another set of rules for the Kafirs. Muslims are to be brothers and sisters to each. Kafirs can be treated well or be harmed. One of the critical principles of Islam is that anything that helps Islam is good.
Islamic ethics are dualistic.