“Agile supporters tell you how you're going to do something, then ask what you want to do, then tell you what you want to do is wrong.” https://news.ycombinator.com/item?id=5406384
Agile and Scrum were intended as just enough process for people in teams to succeed for the benefit of their businesses. If discussing/criticising implementation is non-discussable and not acceptable the endeavour is fucked regardless. The guidelines isn't the problem.