An act of homicide, for instance, is not rendered innocent, much less beneficial, merely by its proceeding from a principle of religion, of honour (that is, of love of reputation) or even of benevolence. When Ravaillac assassinated Henry IV. it was from a principle of religion. But this did not so much as abate from the mischief of the act. It even rendered the act still more mischievous, for a reason that we shall see presently, than if it had originated from a principle of revenge. When the conspirators against the late king of Portugal attempted to assassinate him, it is said to have been from principle of honour. But this, whether it abated or no, will certainly not be thought to have outweighed, the mischief of the act. Had a son of Ravaillac's, as in the case before supposed, merely on the score of filial affection, and not in consequence of any participation in his crime, put him to death in order to rescue him from the severer hands of justice, the motive, although it should not be thought to afford any proof of a mischievous disposition, and should, even in case of punishment have made such rescuer an object of pity, would hardly have made the act of rescue a beneficial one.
IPML Chapter 12 Section 2