What everyone else may have been doing has no bearing on this accident. If you try to fly VFR in below VFR weather you have nobody to blame but yourself if you lose control of the aircraft and crash.
Looking at those pictures, are you sure you want to stick with the cause of the accident being the pilot "losing control of the aircraft"? Just how much control was he supposed to have with that oil spray/smoke? He landed that aircraft on the water in such a way that at least one passenger was uninjured, and they all survived.
If it is common practice to fly below minimums, is that not cause for concern? If accidents are caused by pilots commonly flying below mins, then THAT should be addressed by the TSB/TCCA.
Sure blame the pilot. Do you have something to lose by the specifics of this case becoming public?