Err, no. That was my point. You can convert near any opinions into hypotheses. It doesn't conveniently nullify moral objections people might have about stating certain opinions.
I agree that the testability of an opinion doesn't nullify a moral objection to it. But what do you mean by "near any opinion"? Opinions that rest on empirical data are pretty much the least interesting opinions out there. If I can simply gather some data on the topic to get my answer, then I have little interest in anyone's opinion on the matter. Ultimately the most important things we believe rest on our intuitions and values that are simply outside the scope of science, in principle. There is also another huge category of opinions that cannot be reasonably or reliably tested.