A number of Bernie's fans -- by which I don't mean the small subset of toxic ones but a larger subset including sincere, well-meaning ones -- think that mentioning his liabilities now serves no purpose but to hurt him.
If that were the case, I think there's a good chance it would tank him.
Which he's not.
Because the worst thing you can do is say he's not perfect.
That's true of anybody who runs for office, and it's important.