Fairness, one way or the other, is hard to quantify here. CEO's get compensated a lot more than other employees, in a lot of different ways; you could just as easily argue that isn't fair either. Besides, at the bottom, the CEO is taking on debt that could find him/her bankrupted if the company fails. I don't think it would be responsible to even offer that facility to all employees. It might not even be legal, if the employees are not accredited investors, though I'm not sure about that.
I should add that I don't have any knowledge of who pushed for the deal, and how it was set, but I doubt the CEO strolled in and just asked for the loan. I'm assuming it was part of the compensation package that was proposed or negotiated by the board and their comp consultants.