“since there is no sensible plan to make these people able to defend themselves.”
That’s what Nixon did in Viet Nam—he made them able to defend themselves, then the Cape Cod Orca and other demonrats betrayed them.
Much better to destroy Islam.
South Vietnam was always so corrupt that it was unlikely any amount of aid could have saved them. The NVA's final assault could not have been stopped short of Ford ordering US forces to rush back into the country at full strength.