Which has the most potential to do harm...asking questions or not asking them? Why?

That would depend on such a wide variety of factors that there's practically no way to say either one is more harmful than the other without citing examples. Even then, each example can be rebutted or trumped by a hypothetical.
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Not.

Ignorance is deadly.

I agree with thee hartfire. No surprise there of course! Thank you for your reply m'dear and Happy Saturday! :)