While I'm a staunch DCL supporter and have placed my daughter in DCL's kids' clubs at least once a year for the last 10 years, I think this comment above does a disservice to parents, in general. I think it's fair to expect more than "well, at least we didn't kill your kid".
Telling a parent to be glad your kid is alive is, IMHO, not an appropriate response to this situation. The parent did some things he probably shouldn't have, and expected some things that he shouldn't have. But if I thought my daughter had been missing (even if she hadn't been), and a CM said, "hey, just be thankful we found her in one piece", I would have a very difficult time refraining from assaulting that person.
Tell me I over-reacted. Tell me that, after some reflection, I was irrational. Tell me that you're sorry the security bracelet malfunctioned, but she was never in any real danger. Fine. Tell me, "be thankful she's alive" and you'll need a proctologist to remove my sandal from a certain part of your anatomy.