It is never right that a computer should do the wrong thing.
It may be explicable, it may be avoidable, it may be correctable but if it is wrong it is wrong. We will be living in a world where computers are increasingly autonomous in their actions. Defending their behaviour now sets a dangerous precedent. Will the same people be blaming victims of self driving cars?
So whoever added drugs to the spell checker didn't think it through properly. They need to be told to take them out or put them all in and keep them updated. If we work around things it is us who will become the servants.