Well accidents happen, but it is a bummer that yours costs so much. To be honest I won't place bets on what happens if the lens is attached to a strap and falls of the camera. In the heat of the moment you might lose grip on your camera as well. I wouldn't buy a different strap for this reason. It's no guarantee. And I bet you'll be much more careful handling the camera nowadays.

I personally don't like having a camera hanging around me on a strap. I only have the neckstrap attached for the times I feel I need more safety or at places where I might need my hands to get out fast Normally I just carry it in my right hand. That's why I would vote for a batterygrip over a strap.