Regarding the 'benevolence' of the allied monarchs, both Alexander and Frederick William supported serfdom did they not? Alexander was a patricide and Francis kept Napoleon's son away from his father.
Those are not the indicators of 'benevolent' monarchs.
They were autocrats and absolute rulers, and ruled by decree. In comparison to Napoleon and his reforms and rule, they come in a very poor second.
What did they do to improve the lot of their subjects?
Frederick William's submitted quickly and meekly to French occupation in 1806. The Poles wanted no part of the Russians and Alexander and the northern Italians certainly did not want the Austrians to return.
As for France and the French, Napoleon restored law and order and put the national finances in order. He brought back the Church and quelled the Vendee as well as granting amnesty to the emigres.
Southern France has always supported the Bourbons and still do. They are Royalist in sentiment. And if there was organized large-scale opposition to Napoleon he never could have returned in March 1815.
Once again, sweeping statements are seldom, if ever, accurate historically or otherwise.