"You can't just copy a car."
Yup! And that's why comparing digital piracy with car theft is also equally silly.
Note, I don't have a hard stance on this. Counterfeiting drugs, etc. is wrong for obvious reasons. Coming up with a similar argument for entertainment media is a bit less tenable.
When the MPAA and RIAA cede the moral high ground by acting like idiots (suing 12-year olds, pushing for high criminal charges, SOPA/PIPA, etc.), it makes it more difficult to make a moral argument for the industry.
The everything free argument is crap. But given that I pay for songs on iTunes but pirate TV shows because Derp Studios refuses to put it anywhere online, the user case is valid.