The problem is, the law is enforceable / usable.
One of the things discussed in one of the articles is how the drug forfeiture laws are abused.
In the case of drugs, all they need to seize your property is A: catch you with an amount of drugs (I dont know if its possible for them to use forfeiture laws on someone who has something as small as a joint aka "personal use" I doubt it, but I wouldnt be surprised either) and B: someone to claim you are a dealer. They can take your property then, before you are proven guilty. Then, even if you prove in court you arent a dealer, you still have to go through legal hell to get your property back, it doesn't just get magically given back.
Considering with the MPAA / RIAA basically saying "We can't actually get definitive proof, but we are going to sue anyway." (I can't find the source for that comment, it was slightly more in depth than that, but that was the intent), and the current state of the drug forfeiture laws, I'm curious to see how long before someone gets the computer taken on the grounds that it MIGHT have been used for file sharing.
I hardly think this is in the same boat as century old "crazy" laws.