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PhilGoetz comments on Exterminating life is rational - Less Wrong
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None of the results indicate a possibility that the "energy in the black hole at the center of our galaxy" can be liberated in a giant explosion.
The first result is a 1974 paper by Stephen Hawkings predicting that black holes emit black-body radiation at a temperature inverse in its mass. For large black holes this temperate is close to absolute zero, making them more useful as entropy dumps than energy sources.
On the other hand, if you could simultaneously convert a lot of ordinary matter into numerous tiny black holes, they would all instantly evaporate and have the effect of a single great explosion, so that's one risk to be worried about.
You're right about that. But they do indicate that the energy in smaller black holes can be liberated in giant explosions. And they indicate that black holes could be used as an energy sources. So when you said, "a black hole is not considered a store of energy that can be liberated," that was wrong; or at least it was wrong if you meant "a black hole is not considered a store of energy." And that was what I said was wrong.