Cultures can certainly change over time. I also believe that some cultures are better than others. However, by this point, the culture of Latvia includes significant Russian influences and a sizeable minority of Latvians are of Russian stock. So, Latvian culture is theirs, too.
And you still haven't come up with any examples of me supporting genocide of the Latvians, have you?
I wonder what he thinks of all the Swedish culture that was imposed upon the Latvians for 300 years? Or the Lithuanian culture that was imposed upon them and upon the Belaruss/Russians/Ukrainians? Again, you don't see Latvians in Russia denied citizenship or force to take humiliating tests when they were born there, but then again you don't see NKVD veteran parades either.