I think this is a fair criticism, but in all honesty a determined attacker would probably have better vectors both in terms of companies to trade against and in terms of people with access to actionable information.

Also worth noting there have been times I've thought the price should go up and it went down, and vice versa. While I have a good view into financials (and believe I would have made money insider trading, on the whole), it's not complete enough to warrant something like threats, blackmail, etc.