Upon reading this the next day, I realize it could use a concrete example:
"We should pass a law to strip all legal rights from, and enslave, everyone who is of [pick some minority group]. Neither I, nor most people, belong to that minority, so most of us will benefit from this slave labor."
That's a logical argument. Thankfully, most people today would find it morally repugnant and unacceptable.
"Whoever has the most skill at arguing is morally right."