Bad locations, excessive wind and unstable weather contribute to lots of accidents. On thing that is high on the list, exemplified by your story and mine is "complacency."
"com·pla·cen·cy (km-plsn-s)
n.
1. A feeling of contentment or self-satisfaction, especially when coupled with an unawareness of danger, trouble, or controversy."
http://www.thefreedictionary.com/complacency
Covers it pretty well. Think first, act second, don't bring unwilling bystanders into our sport through poor choices. Again, this isn't an uncommon practice, well maybe sucking on a beer in a crowded beach is rare (I hope). It is a poor practice however, could use a more awareness out there, hence this post.
Any other experiences like this out there?