Arg I
If individuals are motivated by things that are not in their interest , they would perform acts that are
not in their interest in all circumstances
It is not the case that individuals perform acts that are not in their interest in all circumstances
Therefore individuals are not motivated by things that are not in their interest
Arg II
If individuals are motivated by self interest only, then it would be unreasonable to perform acts that
don’t serve their interest only
Individuals are motivated by self interest only
Thus , it would be unreasonable to perform acts that don’t serve their interest only
Arg III
If Individuals are obligated to perform acts that are not in their interests , then they are not
motivated by self interest only
But Individuals are motivated by their self interest only
Thus, Individuals are not obligated to perform acts that are not in their interests
Arg IV
If individuals care about their self -interest only , then individuals perform actions that serve their
interest only
If Individual performs actions that serve their interest only , then individual are obliged to perform
action that serve their interest only
Thus, Individuals are obliged to perform actions that serve their interest only
Arg V
If morality is real/natural for individuals, then individuals would be motivated by things that are not in
their interest in all cases
But individuals are not be motivated by things that are not in their interest in all cases.
Thus, morality is not real/natural for individuals