The country is under an economic siege war and there's constant meddling from CIA/Mossad to institigage color revolution. In the most recent protest we know that they were directly involved because they openly admitted it. They smuggled guns to people on the ground who then attacked police and military targets. This is not normal for a society either.
That's the context in which Iran kills "protesters". It's far more complicated than you seem to want to acknowledge.
But let's revisit this in a year and see if Iran is better off.