Do you think the government would be able to get away with altering data after the fact? If they released it, someone downloaded it, and would be able to easily

Do you think the government would be able to get away with altering data after the fact? If they released it, someone downloaded it, and would be able to easily spot changes. It could even be (and probably is) automated. And either way, what does the blockchain offer if the government comes out and says that some previously published numbers were incorrect, and they publish new ones? You'll have two competing versions of the same data, with one considered obsolete because the government says so. And none of this matters if they're altering the data before publishing.