I don't think anyone is arguing that you should be a douche with a cellphone in a restaurant. Just the opposite.
But at the same time, a restaurant doesn't have the right (in fact it's illegal) to jam your phone. What if a doctor on call can't receive an important phone call and someone dies? What if a firefighter or other emergency worker can't receive an important call? What if your babysitter needs to know where the allergy medication is located? What if someone is having a heart attack and you need to call an ambulance? I'm sure you can think of other reasons that a person may want to have a phone that isn't jammed in a restaurant.
This is why jamming phones is illegal. And I'm sure this is the reason that Pizza Hut isn't jamming anymore. Can you imagine the liability if your jamming caused someone's death or something?
At the same time, if you're a douche and talk (loudly!) on a cellphone in a quiet restaurant, then maybe they should ask you to leave.