I believe that the WORST negative mitzvah of ALL, is to accuse a fellow brethren of a falsehood, by making ASSUPMTIONS.
Shalom AsheDina,
Do you know what the scriptural source for such a commandment? Does this not fall under the category of being a tale-bearer against your fellow?
Assumptions are evil. Thats what I believe. You cant go around making assumptions of people. It is false witness and if the world were right, one would get killed for committing these atrocities.