Latvian as a language never lived better under the USSR, because Russian revolution performance was much ensured by Latvian soldiers hired by Lenin, and that was never forgotten. Among the highest Soviet officials there always been Latvians. Boris Pugo being the last.
Learn your own history from professionals, not from tabloids full of hate speech.
UPD: By the way, its Latgalian that is PTE. Latvian is simplified Latgalian. It may look as a bit of exagerration, but truth is worth discovery.