You seem to be implying that all climbers take safety seriously and that no hikers or backpackers do. If so, your assertion is absurd.
I have been climbing for over 60 years both as a climbing club member (Seattle Mountaineers) and as a non-affiliated climber. In that time I have witnessed some truly reckless behavior by both club and non-club climbers. On the summit of Lundin Peak near Snoqualmie Pass east of Seattle there is a plaque memorializing a climber who died in a fall from the summit. What is not mentioned on the plaque is that the climber fell when a rappell sling fashioned from bootlaces failed during a rappell. Was this guy following your claim that "safety in climbing is taken VERY seriously".
I suspect that reckless behavior is fairly uniformly distributed among climbers, backpackers and hikers. If there are more accidents due to reckless behavior reported for hikers and backpackers it is probably because there are more of them.
every climber that is "officially" taught whether in a climbing gym, by guides, or in a mountaineering groups is taught "safety" first and foremost
if you are a climber than you know the absolutely importance of a safe belay, safety on rappel, clear safe communication and commands, etc …
now not to say there are those who dont do stupid things on purpose …. those people tend to be pretty well known among climbers, and for the most part avoided by most …
one thing you realize in climbing is that there is nothing such as absolute "safety" … for example you may want to build less than perfect anchors, put in less pro in order to bring less gear to reach the top and get down faster to avoid getting benighted …
EVERYONE who has climbed alot has done something stupid or had a brain fart while climbing and had a near miss … however most of us who live through it realize its stupid and seek to prevent it from re-occuring … and
there is also a difference between making a stupid mistake avoidable mistake, and knowingly taking a risk while climbing … the sad part is that most accidents happen on belay/rappel and are easily preventable …. not because one chose to lead a R or X rated climb
in climbing we develop systems in order to catch ourselves … which is why good partners tend to double check each other (as in scuba diving and sky diving) and take other precautions ….
you have mentioned reckless behavior by your club members … i hope you reported them if the behavior was truly dangerous, in a mountaineering club event, such activities should not be allowed
ill repeat it again … climbers and climbing media treats accidents seriously for the most part … and their reports are things to be scrutinized, not "oh well itll never happen to me" …
perhaps you can provide the "hiking" or "backpacking" version of Accidents in North American Mountaineering … since hikers and backpackers place the same emphasis on safety?
as to "day hiking" … i suspect that this is one of the prime activities of BPL members … perhaps even more than "backpacking" due to time/work constraints, and most likely dont bring their UL down bags, pertex bivies on such hikes … of course there are probably members who ONLY do multiday hikes … or who bring the whole shebang for a day trot as well
;)
edit to add … this data is from a few years ago, but i expect the trend to be roughly the same still …
IMO hiking and OVERNIGHT hiking accidents are serious issues … both in numbers and in terms of time/resources …



from the american alpine club 2005 …
http://tinyurl.com/anaoxow