Interfering with, thus ruining, a good situation in motion, wasting effort all the way -- this is the worst imo.
No foresight works if new situations can be jumped on as opportunity!
Worst example was likely-xSE manager. Panicked and changed plans. Ruined workers' preparatory work and flow. Panicked more. Got more stupid and ruinous. No one could save him. Would have been better off if he'd have stood in a corner and drooled.