I have suffered a martyrdom from their incompetency and caprice.

我因他们无能和反复无常而殉道。

His incompetency is reflected in his poor choice of appearance.

他无能反映在他糟表选择上。

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

他总是神贯注地听发牢骚，说失去了顾客，放了呆帐，约翰逊先生如何欺骗，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。