The Old Testament is full of stories about the children of Israel, how they personally witnessed great wonders with their own eyes, and yet turned away from God in disbelief and rebellion. These stories might seem corny or simplistic to some, but they were written for a reason:
Now these things occurred as examples to keep us from setting our hearts on evil things as they did. (I Corinthians 10:6 NIV)
The simple fact is that decisions have consequences. Rebellion against God has consequences. We need to set our heart on loving God and loving our neighbor as God commands, rather than setting our hearts on evil things as they did. There is a clearly right and a clearly wrong response to most situations. Our culture likes to tell us that most of our responses are neutral, but that is simply not the case. The most important truths in life are simple. But sometimes we want to complicate the matters in order to hide from the truth and give ourselves an excuse for choosing evil.