The listed option price is the price per share, and a standard option contract is 100 shares of exposure.
Are most of the inside traders that get caught non-professional investors, because the pros know how to escape detection? Are the convictions a small fraction of the number of crimes? Is the SEC too focused on crimes that are easy to prosecute and ignoring more important systemic issues? I'd say yes to all, but the SEC is far from toothless in this type of case.
There is no special immunity for insider trading for Congress. https://www.everycrsreport.com/files/20170412_RS21127_36174d...
The screenshots seem to show a total traded volume for yesterday of 260 contracts (26,000 shares), way smaller than what was suggested.
Furthermore, nothing makes it clear that these were all the same person. And the open interest went down that day so at least some of this volume was buying to cover.