Insider trading isn’t the only potential motive for an action like that. A competitor could pay a mole to help them get ahead by taking down the competition, for example. I’m skeptical that insider trading law plays a significant role in preventing schemes like this from occurring. The entity with the strongest incentive to prevent a company from being sabotaged is the company itself. Insiders can complain to regulators or prosecutors if they think something like this is happening, and that’s pretty much the only way they’d find out.