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If you're talking about the FDIC, that protects you only in the case that the bank fails. It doesn't have anything to do with fraud against you in particular.

Yes actually it is, because the analogy is your storing your fiat in your house or in your pocket, which can of course be robbed, have you even insured cash stored in your house or pocket, I highly doubt it.

Just like fiat you can store your crypto with an insured custody provider (and still own your own keys), which is the norm with smart people who have a decent amount of crypto assets.

Your savings account is getting drained every year. The mechanism is called quantitative easing.

Quantitative easing doesn't drain anything except treasuries. It just swaps treasuries for liquid reserves. Banks may lend more but that is a different question.