The problem is, now - for the owner, he's going to be looking at a massive increase in insurance premiums, when he's up for insurance renewal - because the insurance company will be closely scrutinising whether the owner has a less-than-satisfactory level of attention to safety procedures. Insurance companies are proper b*&%$#ds, they make bank look generous. My broker assured me after a major claim, caused by a careless employee, that the starting point for renewal of premiums, by insurance companies - after a major event - is the cost of the last event, added to your current premium. Brokers work hard to negotiate premiums down from that start point.
For a bloke running a business on high turnover and slim margins - a major increase in insurance premiums, is the last thing he'd want. An employee who does that level of damage, due to what even a generous soul would describe as a "moment of carelessness", would more than likely be on the road, looking for a new position, under most circumstances - after the employer has decided he's too expensive to keep on the payroll.
After all, there are plenty of others likely to be eager to take his position, and to be more caring of the boss's high-value equipment. The second headache for the employer is the cost of rounding up replacement planes, and the lost income while the replacements are being sourced, organised, and set up to earn money for him/her again. Just as taxi-owners get furious at their taxis being pranged - it's not the actual cost of the accident, it's lost time and income, while the replacement is being sorted. Yes, they're only machines - and yes, no-one got hurt, fortunately - but the owner is going to suffer a major financial penalty due to the actions of one careless employee.