But you can. Napster launched, what, 13 years ago, and desperate upon desperate law has not even put a dent into the explosive growth of piracy.
The actual problem for most people though isn't that copies or drugs are especially difficult to obtain, but that they might find themselves in a courtroom for procuring them. Technology hasn't changed that; arguably Napster and SilkRoad made it easier for vested interests to generate moral panics around pirating and drug use, and to ensnare people attempting to download music or mail-order contraband. You didn't get children facing lawsuits for making mixtapes in the 1990s.
It's hard to argue that low-friction, even non-DRM, digital music sales wasn't brought around (or at least, brought around much faster) by piracy-induced pain. The RIAAs would have been more than happy to use the law to shut down piracy (in effect, their competition), but even tough the law obliged them, the customers didn't.
I'd call that fighting the law.