Shavuot: What is the Torah? - continued

Audience questions after the Shavuot lecture. What is the balance between mercy, justice and lovingkindness in the world? What is evil? G-d created the Torah in such a way that it enables disputes and baseless hatred and even complete lies such as Christianity - all in an effort to protect the Jews. How could the Jews commit the sin of the Golden Calf? What exactly was the sin?