> However, when ignorance of the law is provably impractical (impossible, in this case, for a single individual) and acting reasonably causes you to violate it, it is absurd for our society to punish you.

While it may be absurd for our society to punish you in that circumstance, our society will punish you in that circumstance. In other words, "it's absurd" isn't a legal defense.

Ignorance of patents, like ignorance of law, is no defense, no matter how impractical knowledge is.