Quite a few studies show reduced risk of colon cancer with increased intake of fiber.
I’d need to see the specific study and read it. In my experience, “studies” show whatever people want them to show. A genuinely good study is rare, and even rarer when it comes to nutrition - where the vast majority involve associations involving groups where dozens of variables are involved.
Did the study compare JUST fiber? Or “high fiber” compared to the standard American diet?