This is because you have to be modest, and not have blind confidence that "what I see is Taiwan." You have to thoroughly and realistically collect all kinds of objective data for analysis to support your point of view. You can't just think, "well, this is obvious."
因為你只好謙虛，沒有自認「眼見的就是台灣」的盲目自信，要紮實地蒐集各種客觀資料來分析、來支持自己的觀點，不能再「想當然爾」。