It's always true given the context. In your example, you could be charged with criminally negligent homicide or reckless behavior. After all, you had no intent to cause harm, but you knew full well the recipe you gave could be used for harm.
It's no different than handing a room full of convicted murderers a loaded gun and walking out. No, you didn't MAKE them grab that gun and go kill somebody, but you knew full well who was in the room and knew full well it could lead to no good.
Of course, the odds of it ever being linked back to you (with regard to the thermite recipe) are very long indeed. But if an armored car gets jacked and 5 people killed and that person spills his guts that he got the recipe from you on this forum, you can expect to be hauled away in cuffs in a matter of a few days.