This only really applies in a world of complete information. Pesticide side effects were an enormous externality, which only the company was aware of. And they obviously worked hard to keep that information out of the public consciousness. Perhaps there could be nuance to producing the pesticide, weighing food prices against health impacts, but that’s no justification for lying about what it does.
The second objective is easier than the first. It may be easier to find any M1 and M2 that collide, than to find an M2 that collides with a specific M1.