Charity is commendable; everyone should be charitable. But justice aims to create a social order in which, if individuals choose not to be charitable, people still don't go hungry, unschooled or sick without care. Charity depends on the vicissitudes of whim and personal wealth; justice depends on commitment instead of circumstance.
Charity depends on the vicissitudes of whim and personal wealth; justice depends on commitment instead of circumstance. Faith-based charity provides crumbs from the table; faith-based justice offers a place at the table.
The printed page conveys information and commitment, and requires active involvement. Television conveys emotion and experience, and it's very limited in what it can do logically. It's an existential experience - there and then gone.
Presidents are afraid to lose wars. They're afraid to be outflanked on the right by the militarists. They don't want to be seen as soft on either communism or soft on terrorism or whatever. So presidents are constantly tugged away from their domestic commitments to foreign policy.