The Parisian Mob seems to have been a problem all by itself ~ and as was typical in large cities througout Europe in that time would sometimes make national policy with a local uprising.
We've learned to ignore the MOB in these modern times ~ else our politicians would be running to and fro seeking to molify this or that focus group or pollster!
Oh, guess we haven't begun to ignore the MOB either have we. Well, my mistake.
The whole thing in France started over the claim by various members of the royal family that they didn't need to attend mass at the cathedral because they had their own personal priests to take confession and administer other sacraments, and, besides, they could read, write and cipher better than any mere cleric.
That, and the adoption of polygamy by the top nobles in the 1400s set the stage for a rather abrupt break incivil re lations. The duc d'Guise's own Great Grandfather had two wives and three concubines ~ he disagreed with that custom in fact. Later, after the end of the war the King of France was provided with his first formal State Mistress!
I think part of the Catholic concern was a bunch of them imagined they'd WON but they'd lost ~ the Huguenots were still there, the King still had a harem (2 or more is a harem) and now courtesy of the national treasury, and Protestant merchants sailing under French flags could do business with Catholic merchants in other lands with which France had treaties of commerce.
My word, they must have been angry as wet hens!
-- of course, this was the 1500s, remember? you support the losing side in a political battle (like the Huguenots did in France, the Catholics in the UK), you die.