Your assessment is oversimplification -- Read between the lines.
When I sell calls, they are covered calls -- no unlimited risk. Just (potentially) selling my stock for a higher price than the day I initiated the hedge (and if it is an equity I am planning to hold at the current price). If it goes up -- I make more money than if I just sold. And if it goes down, I close out both positions and temper the downside.
And why would an options specialist routinely short to offset selling options -- again -- that position opens unlimited risk.
A shortseller can buy calls to mitigate the risk of the stock rising explosively and cap losses.