Impact in terms of what? Alleviating suffering or helping to fix the institutions whose brokenness has let the problems fester?
You act like "fixing" the political institutions in a foreign country is some trivial thing, as if people haven't been trying and failing to make interventions like that for a hundred years.
I think the hypothesis of: make healthcare, credit, etc widely available, and the political landscape will change much more probable than the counter hypothesis: fix the political landscape through some intervention and healthcare, credit, etc will follow.