I have suffered a martyrdom from their incompetency and caprice.

我因们无能和反复无常而殉。

His incompetency is reflected in his poor choice of appearance.

无能反映在糟糕外表选择上。

He listened to her moans about lost customers and bad debts, the swindling ways of Mr. Johnson and the incompetency of Hugh.

总是神贯注地听她发牢骚，说她怎样失去顾客，怎样帐，约翰逊先生如何欺骗她，以及休多么无能，等等。

So to answer your question directly, you ask what the cause is, it's incompetency and perverse incentives.

所以直接回答你问题, 你问原因是什么, 这是不称职和不正当激励。