In short, it's morally blameworthy when you knowingly planned on doing something known to be immoral (i.e. illegal).
But then Paul indicates the Jewish view that we have a good inclination and an evil inclination:
"For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate," Romans 7:15
It's paradoxical that someone could have 2 opposing wills--to knowingly commit a transgression of the law even when they desired to not commit said transgression. It's like saying there both "is" and "is not" mens rea. It's logically impossible.
So this is just a musing I was having. I'm not sure how to understand this verse. Anyone have any thoughts?