I'll first comment on the subtitle:
Free will not free will if you get slammed for making a choice.
That seems like a wrong conclusion. It opens the possibility:
Since you violated the law, you get slammed for your choice. Therefore you did not have free will in making the choice. Therefore the criminal law should not apply.
The idea seems to reduce the criminal law to pointlessness.
Now onto my views on original sin:
"It's not my fault, it's Adam's for bequeathing me a fallen nature"
Personally I think the idea of original sin is a misreading of the story. Perhaps the misreading originated with Paul.
To me, the idea behind the story is that man was created biologically as an animal (an ape, just as the theory of evolution would say). What differentiates man from ape is not biology, it is that man has knowledge of good and evil. The eating of forbidden fruit is simply a metaphor to account for this distinction.
IMO the conclusion is not that we are sinful due to Adam's mistake. Rather, it is that we know good from evil, and hence cannot use ignorance as a way to deny our sinfulness. Since an innocent baby does not know good from evil, that baby is indeed innocent.
Philosophers sometimes refer to "the principle of charity". The principle is that, when reading what somebody has written, one should attempt to understand it in a way that is charitable to the author. Here, "charitable" is intended to imply that the text as interpreted makes sense as rational argument or choice by the author.
In reading the Adam and Eve story, I think we should read it in a way that is appropriately charitable toward God.