If you look just at the decades after 1934 you know it's hard to point to really inspired and positive support from outside of Haiti to Haiti and much easier to point to either small-minded or downright mean-spirited policies.
It is true that you can't prove a negative. However the existence of God is provable in the same way a building is positive proof that there was a builder.
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I had to come from something come from a place that was negative and positive but the majority of it is a negative place.