Plus calling these things "sabotage" isn't right even as a metaphor, and IMO confuses the issue. These people aren't on a third-party payroll, they are just self-serving.
No one is creeping into your office in the middle of the night. You invited them over, let them in, watched them piss in the fish tank, and then gave them a promotion and a raise. Now you're surprised everyone is lining up to fuck up the place? As usual the value judgements are just a distraction in matters of economics, look at the incentives.