Except when you are being taught by another person, all new knowledge comes from your own observation, trial and error. When you are learning from another person you are learning about the aggregate of incremental failures that they made, finally leading up to a success. Very rarely do things totally succeed on a first attempt.

How can you possibly say failure can't be useful? How do you iterate your plans and designs? I don't think you appreciate how knowledge works. Your weird demonization of failure (including it somehow being a moral issue?) won't force success, it's just going to stop you from realistically evaluating your goals.

Aside from that explanation, I'm not dying to debate you or list exhaustive examples or whatever because you're belligerent and arrogant. People like you can't be convinced, you have to go through it yourselves several times to figure it out, if ever.