Stealing a credit card is stealing in itself, you don't actually have to charge anything. The analogy isn't valid. The correct analogy is the fact that you can use Google to find numbers that look like credit card numbers. Similarly, hosting a copyrighted file is illegal. But providing the means in which to find said file is not.

There's a reason why the world should work this way. I can use a wide array of objects as a lock pick (i.e. a banana). To prosecute me for walking down the street with any of these objects (including actual lock picks) is just ludicrous. Hence why the law says that I actually have to demonstrate the intention to use a tool to steal something in order for it to be a crime. And in any case, the took maker is usually never liable.

It's a very simple idea. Prosecute the criminals, not the people who provide tools which might be used in a crime. Obviously there's an upper limit. For example, a grenade is a pretty unambiguous, single-use tool. That's why selling one is illegal. But most tools have many uses, some illegal and some not. It's an impossible task to go after the tool makers, so just go after the criminals.