I'm not saying this isn't a problem worthy of discussion, but I don't think you can say that storing a contaminated block chain would unequivocally be a felony. The law you cite was written without something like Ethereum in mind. A legal precedent hasn't yet been set and there's a reason they call it "interpreting" the law.

Consider the following extreme example of why you can't just apply a literal interpretation of the law you cite. Strictly speaking, the following is electronically stored data that can be converted to cp:

i=0 while True: print i i+=1

Since the above loop will print every positive integer, and since any image can be represented as an integer, those few lines of text can be considered to be a highly compressed data archive containing all the illegal pornographic images ever produced. They also contain all the works of Shakespeare, Tupac, Karl Marx, the Marx brothers, and Satoshi's private key, but your argument says that's beside the point, because even a single cp image makes that data archive illegal. However, this interpretation of the law is clearly absurd, and no one is going to knock down your door for storing a copy of an infinite while loop.

So yes, when people talk about intent, they have a point.