expedient

Most people, faced with a decision, will choose the most expedient option.

[T]he judges were unanimously of opinion that … by the common law of England, no man, not authorised by the crown, had a right to publish political news. While the Whig party was still formidable, the government thought it expedient occasionally to connive at the violation of this rule.

But the Expedient, in the sense in which it is opposed to the Right, generally means that which is expedient for the particular interest of the agent himself; as when a minister sacrifices the interests of his country to keep himself in place.

the adverse winds / Whose leisure I have stay'd, have given him time / To land his legions all as soon as I; / His marches are expedient to this town / His forces strong, his soldiers confident.