Not so sure about the "short sellers are a necessary ingredient in the stock market" part.
1. Over the years CTSO has received around 30 million USD in grants - as I assume mostly tax payers money.
2. Hence, we assume CTSO is grants-worthy - working for a good cause, changing medicine and saving many, many lives.
3. Stock prices should be as fair as possible - and in my opinion it is fully sufficient to have the option to be either long or flat to derive absolutely fair prices.
4. Short sellers tend to put enormous pressure on cashflow negative companies such as CTSO - who in the crucial and forming years have practically no other choice than to invest heavily in R & D.
5. In the context of a grants-tax-payer-money worthy company like CTSO in my opinion it would make perfect sense to politically not allow or ban short selling immediately.