Apple's language, designed for a layman, may be a little imprecise. But it paints exactly the right picture. By allowing the FBI to remove the anti-hacking measures, they make the phone easily crackable. And in legal terms, once they've done it once, and it is a matter of record that this build of the software exists, than it can be easily and repeatedly asked for.
Today it's to "combat terrorism" (although these particular terrorists are already dead, and any information on the phone is weeks old); tomorrow it could be because you might have ordered soda in too large of a serving size. And that's just for the US. The second Apple agrees to do this for the US, every other government will demand the same tools, some which won't even pretend to have any valid reason.
I look forward to a day when our government can demonstrate that it will use extraordinary tools for extraordinary purposes only. Until then, the only safe policy is to not allow the tools to exist in the first place.