Resilience or Acceptance?

Woke up to the news that there has been another terrible attack on innocent people, this time in New York. The immediate response from the authorities is that the people of New York are resilient. That same claim is always made about Londoners, Parisians, and any other group who suffer such an attack. But what is resilience?

A dictionary definition might be;

"the capacity to recover quickly from difficulties; toughness."

But are we truly seeing resilience, or could it be something else? 
Apathy?  Indifference?Acceptance? 
It is important that we understand the difference and I'm not convinced that a genuinely resilient society would be experiencing such high levels of mental health issues.