New-born children should not be circumcised because that violates their right to self-determination.
The argument form is alpha (a is X because a is Y). This is clear from reconstructing the argument in the following way: “Circumcising newborn children (a) should not be done (X), because that (a) violates their right to self-determination (Y)”.
The conclusion is a statement of policy (P) and the premise a statement of value (V), so the argument substance is PV: “Circumcising newborn children should not be done (P), because that violates their right to self-determination (V)”.
The keyword PRINCIPLED MOTIVATION describes the relationship between predicates Y and X. The argument lever can thus be formulated as “Violating their right to self-determination (Y) is a PRINCIPLED MOTIVATION for not doing it (X)”.
Other examples
Notes
PERIODIC TABLE OF ARGUMENTS 