Being in breach of a patent is nothing more than theft of intellectual property. Theft is theft no matter how small and seemingly insignificant. Apple pursues patent breaches just as vigorously in the reverse and is often on the side of these things so can't really cry and complain when it doesn't go their way.
And really, I'd behave a little pissy too if someone didn't pay a $1,000,000,000 royalty bill.
Neither company is a good guy here. Apple has been thumbing their nose at courts all over the world for a long time now, ignoring orders and really testing the extent to which they can delay and refuse compliance.
Qualcomm definitely abused their IP and is just pissy they don't have a psudo monopoly in RF anymore. They've also been known to royally rip off smaller companies that simply couldn't afford to fight them in court.
This is a problem that really extends to all the big tech companies: Amazon and Google included. They're getting too big. It's nearly nothing for them to throw a $10mil budget at a bluechip law firm or two and tell them to frustrate, stall, and delay by any means necessary. On top of that, at least Apple has been making the argument in the US that they're too big and too important to enjoin, and at least one judge has bought the argument. That's crazy!
I have little faith it will happen, but we need some regulators with balls to break up these companies. At least Apple, Google, and Amazon need to be broken up into smaller companies.