Advocating mass killings is not seen favorably around here.
Republican ideals have nothing to do with the blood they were drenched in.
Such false accusation are even less favorably seen here.
I doubt that killing every noble in France would have been a "mass" killing. But i doubt they would do so for some practical reasons : they were busy with serious things like war. The Terror was seriously limited and outsde Paris (the First Commune of Paris is somewhat a special case) you'll see that the local elites (bourgeois and annoblished bourgoies, or more rarely embourgeoised nobles) were the most supportive Montagnards, especially after the tentative of revolt of the great land-owners (under the Federalist or Royalist banner) that threatened their power.
I remember havin seen the letter of support to government send by the revolutionary club of Montauban durin the revolution. At each one, you have a spport.
By exemple 1790 "Lon life the king, that brinf justice and peace to the nation",
in 1792 "Down with the tyrans, long life the Republic!", in 1794 "Hurrah for the Montagnards, thanks the Supreme Being we entered in a new era",
in 1796 "Thanks the brave Directory to have save us from the periles of blood-thirsty and tyranny",
1799 "The courage of the First Consul for preserving the Republic couldn't be enough praised",
1811 "God blessed the Empireby giving to the France and to the Emperor a son",
1814 "The Heaven would be praised to have put the rightful monarch of France under the throne",
1815 "Down with the impostor, long live Napoleon",
1815 "Down with the impostor, Long Live Louis".
You don't have a real separation between the eras, and the elites were always in charge, except ponctually with Paris and some cities.
Now, as Remicas, i doubt we could say the French Revolution failed. If we accept the classical timeline of 1789-1799 as the era of the revolution, we could say it suceeded.
The outcome was a modern state, the definitive end of order system in France and the aeras where it was exported in Europe, the unification and the rationalisation of administration...