I don't think your response could be bettered. Fantastic!
To pretend there is a close analogy between borrowing money to buy shares and shorting a share draws a very long bow indeed. Money is the universally acceptable medium of exchange - shares are not. Money generally acts as a predictable store of value, whereas share prices do not serve this function. Instos enable shorting without the share owners knowledge/approval whereas if one "borrowed" money in order to buy shares without the knowledge/approval of the rightful owner of the money, that is called thieving.
Anyway, why am I trying? Just read Stumacco's answer.
PNA Price at posting:
$1.88 Sentiment: LT Buy Disclosure: Held