I think you misread parent. You seem to refer to the excesses of the French revolution, not of the French monarchy. It's true that France would not know the same kind of mass executions all over the country again, but it would exert occasionally a ferocious repression during its wars (eg, in Spain during the Napoleonic Wars) or in its colonies (eg, the massacres in French Algeria just after the end of WWII).
No, I was referring to the excesses of the monarchy. I think North Korea is one example of a Communist country that has gone above and beyond any ancient monarchy with its terrible mix of poverty, starvation, exploitation there. And it's still going that way even today.