Or at the very least, if nobody owns it (as some people seem to believe), then content creators shouldn't be deceived into thinking that they own it and that society won't just pass it around. Whether or not IP exists, society at large needs to mostly agree one way or another, or a lot of people will put a lot of effort into something they wouldn't otherwise, and they won't be reimbursed in the way that convinced them to put in the effort in the first place.
That's besides the point. They can break the contract, and then you don't have the content. They've already won at that point, if they want to pile one, there's no reason not to.
Compiler writing is easy? No. (I've built compilers for large subsets of C and Java, as well as my own languages)
Lord help you if you try to write a perfectly conforming compiler for C++ (has it ever been done?), and the U.S. legal system is at least an order of magnitude more complex than that.
To make that task even more complicated, people don't agree on what many of the rules are. Your "law compiler" would have to take in input and have output that's maybe this, or more likely this, but it could also be this...
Compiler writing isn't the easiest thing in the world by any stretch, but it's something that we manage to achieve all the time, unlike the mythical "program to do my programming" we are so quick to imagine.