The point is, whatever the hammer and sickle may have symbolized at one time (though totalitarianism is a necessary outcome of any state communism), what was done under its banner was the largest mass murder in all of history.
You may wish it weren't so. You may wish the hammer and sickle were not associated with such things, or that the banner of communism weren't.
But it was. And much like the Hindus who might like to have the swastika back free and clear, it just ain't gonna happen.
But even that's not a good analogy, because the swastika didn't symbolize anything Nazi until the Nazis co-opted it and made it famous. But the Communists were following what WAS symbolized by the hammer and sickle and carried it out to its inevitable end.
Because after all, even in the best of situations, communism only works if everyone's on board. But in a large population, that's impossible, so you have to deal with dissenters. From there, it's a very short leap to repression and totalitarianism.
And that's why they all did it. It should not be surprising that mass murder followed.