Earlier quoted context omitted.
Seems you are shakey ground, without empirical justification, to say that in the majority of cases when applied scrum goes badly. We are probably at the point of trading ancedotes, but I'd say in the majority of cases where I have seen it applied it has worked more than it has not. Even a poor implementation has yielded some benefits. And those pieces that have not worked there are reasons why.
I agree we might be at the point of trading anecdotes. I would suggest though that there could be the problem that a team works hard to produce good outputs in spite of Scrum, rather than because of it . My feeling, as I have mentioned elsewhere is that this burden of proof is on Scrum and Scrum proponents to back up the claim that it facilitates better business outcomes than would otherwise have been obtained withou…
Of course one could argue that the improvements were the result of some other phenomena. But it certainly seems that the equation seems to have worked and turned teams around. Scrum wasn't in the mix before and now it is things are much improved.
By the way I'd in no way advocate a one-size fits all solution. Sometimes other techniques might be as effective or more effective. I'd not say you should agree another way is definitely better if your team is humming along. Why would I?