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but why adsense don't disable invalid clicks and protect publishers?
They do identify and throw out invalid clicks--not to protect publishers, but to protect advertisers (their paying customers).
google analytics gives them a lot of that same info.
So of these people who get banned for no reason know to them, how many I wonder are google anylitics. Is this really a protection against losing your account to click fraud?
I'm very reluctant to hand over such valuable information.
If someone is a victim of click fraud, and G doesn't believe s/he isn't responsible for the clicks, s/he can be dropped from the program, regardless of whether s/he submits logs or uses G's analytics package.
Ask yourself this question. How can one prove one is not responsible for clicking on one's own ads? Are logs proof? What do they prove?
Also read up on Byzantine failure in computer systems for an understanding of determining whether or not some set of systems can be trusted to act in some particular way.