There is a well known teaching that appears several times in the Talmud and Midrash (JT Yoma 1:1, Yalkut Tehillim 886), which states that ‘any generation in which the Temple is not rebuilt, it is considered as if that generation had itself destroyed the Temple’. Certainly this would seem to be a rather severe judgement, for as the Sefat Emet points out, many generations containing many great and righteous people have passed without the Temple being rebuilt, and it would be fairly extreme to say of them that they had personally destroyed the Temple.