Rotordog - the reason that these accidents didn't happen to you in your R44 is that you probably wouldn't have been under the pressure to fly that these guys were. As SASless points out they were both returning from missions which meant they had got airborne very quickly - I'm not saying they weren't properly prepared, but it's very different spending an hour doing pre-flight planning and met checking from launching in 5 minutes on a rescue job. With all the adrenaline pumping, crews are usually very sharp and aware but once the job is finished or cancelled there is a natural slump in arousal levels as all that is left is the return to base. This is the time when people get caught out and crews and management need to be aware of it.
Steve76 and w_ocker make very good points - EMS is a business and therefore commercial pressures apply, on top of all the professional ones. Unless the pilots are confident that management will back them up when they decide not to fly, they will keep on pushing the limits and some will get hurt.