Here is a quotation from Karl Barth, as he reflected on the reason why he abandoned liberal theology.
For me personally, one day in the beginning of August of that year  stands out as a black day, on which ninety-three German intellectuals, among whom I was horrified to discover almost all of my hitherto revered theological teachers, published a profession of support for the war policy of Kaiser Wilhelm II and his counsellors. Amazed by their attitude, I realised [sic] that I could no longer follow their ethics and dogmatics, or their understandings of the Bible and history, and that the theology of the nineteenth century no longer had any future for me.
Karl Barth, Evangelische Theologie im 19. Jahrhundert (Zurich: Zollikon, 1957), 6.