South Coast - as I don't work for AirServ I cannot in all honesty answer that question accurately.
However there were two parts to my statement, firstly that "I don't think any person or organisation would ever want something like this to happen once, let alone more than once." - this I do think applies to anyone and everyone, including those at AirServ.
Secondly "do you not think that the parties involved have taken every opportunity to learn from previous mistakes and implemented precautionary measures to prevent accidents from happening?" in light of the above statement which as I've said I think does apply to AirServ, I would go with yes.
If you really want to get in to the nitty gritty, you would need to to look at the number of incidents which have occured as a percentage of the number of flights that are done, over a specific period of time, per aeroplane type. You could then examine, analyse and extrapolate the trends, causes, effects, fatalities etc. in relation to the fleet size, pilot hours, schedules etc. which would give you a far more accurate understanding of what actually is happening with in the organisation. Simply stating the number of accidents which have occured on what planes and viewing these in isolation doesn't mean much.