Humans make decisions subjectively.
When a human makes a subjective decision he (or she) is uniquely qualified to do so, yet some may call that selfishness. If ego-driven it may indeed be selfish but if truly exercising the spirit of the independent investigation of truth it is not selfish just subjective. In such an instance there is one and only one person qualified to make the 'correct' decision, which is that particular unique human being. If a methodology cannot permit this it would not be an appropriate methodology for the human sciences.
Within the classical liberalism tradition and within the Austrian economics tradition the praxeological science of economics is advanced by those who use the methodology of subjectivism. What is new and exciting is the development of economic models using subjectivism! Contact me and I will show you some examples.