Yes, the mass executions by the guillotine were necessary to get rid of anti-revolutionary opposition
No, it was heavily immoral to execute many and was a way of unnecessary reigning terror
No. The Reign of Terror in France sowed fear throughout the country. Thousands of innocent people were accused of working against Rospierre's fledgling government and were killed in the most horrific ways.
just like it is immoral for the US to rein terror all over the world.