As a human being your state of mind and mood is likely to influence the interpretation and analysis of data in a qualitative research study. It is therefore imperative to know such issues and address them accordingly.
Being a researcher, one must know how to detach ones emotions, moods and biases when analyzing the data. It is one of the ethical considerations too. If someone is overridden by emotions, he should wait for his mood and emotions to settle down so that he can give his best.