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Wikipedia's policy is that errors in existing pages should not be fixed.

Are Wikipedia's "actual" policies the things that Wikipedia says it does, or the things that Wikipedia actually does?

I don't know where you are going, but I did fix several articles already and never had a single issue with it because my sources were correct.

Yes, there might be bad actors, but it doesn't mean that everything is bad and impossible. You should try first, at least.

Wait what? Is the whole point of wiki not to improve and correct?

Try it and see what happens.