1)
Why is their sin worse than that of their fathers?
1.
Radak (12): You are punished more, for you persist in the sins of your fathers.
2.
Malbim: You know the Torah, but do not want to heed it.
2)
Why does it say "you go in the freedom of your evil heart, not to heed Me"?
1.
Malbim: For every Mitzvah, you seek claims and pretexts of heresy why you need not heed Me. Your fathers sinned amidst folly and error; your sin is amidst intellect and Mezid; you intend to rebel against Torah.
