The reason is believed that they were told of the status of Kaga Ikko ikki Revolt (an uprising by followers of the Ikko Sect in Kaga) and Ishiyama War, and they feared the Ikko Sect.
加賀一向一揆や石山合戦の実情が伝えられ、一向宗が大名によって恐れられたのが原因と考えられる。