Asphyx of days when blades turned blunt

According to this calender
Nine thermidor, year two
Age of the national razor
Humane mass-murdering tool
Execurtioner's grinning
As the axe comes down
Swift smooth separation
Off goes another crown
Thus kings and queens convicted
Like marie-antoinette
Her mug too in the basket
By pulling the lunette
Sentenced by thousands
Under la grande terreur
A dark tale of represson
And the beheadings that occured
Pre-eminent symbol
For blood the masses roar
Indomitable justice
The crowd demanding more
Square of decapitations
Place de revolution
Where severed faces murmur
Of days when blades turned blunt