The Pope Innocent III excommunicated the Count of Toluse because he would not commit the murders. Simon de Montfort had no such problem and committed the atrocity.
St Dominic founded the Dominican order that held sway over the Inquisition.
The Pope had blood on his hands
No, they weren't. They denied that Christ is God and that the Bible iss the Word of God. They were antiChristians, not Christians.
The Pope declared them to be heretics
True. They were heretics.
and massacred them.
The Pope did not draw a single drop of blood from anyone. Nor were the Cathars massacred. The garrison of soldiers at Toulouse was put to the sword by the King of France - not the entire Cathar population.
It was genocide.
Maybe you're unaware of the meaning of the word genocide. It means the murder of an entire ethnic, linguistic or religious group. That never happened - there were still thousands of Cathars around after the war ended.
The Pope Innocent III excommunicated the Count of Toluse because he would not commit the murders.
No. Pope Innocent III excommunicated Count Raimond because he (a) had permitted members of the clergy to be killed, (b) violated his oath of fealty to his sovereign and most of all, (c) blasphemed the name of Christ.
Simon de Montfort had no such problem and committed the atrocity.
Simon Montfort killed almost every member of the Count of Toulouse's hostile army. That's not an atrocity - in a declared that's called "winning". If those involved did not want to die, all they had to do was not take up the sword against the King of France.
St Dominic founded the Dominican order that held sway over the Inquisition.
The most prominent administrators of the Spanish Inquisition were indeed Dominicans. But any "sway" over the Inquisition was held by the Spanish monarchy which financed it and did the hiring and firing.
The Pope had blood on his hands
I hope these disconnected statements were not intended to be a syllogism. Your claim was that the Popes ordered and supervised genocide. That never happened - it's a historical fiction spun out of Foxe's brain - the same Foxe who smiled with approval as the British Crown and the Protestant Archbishop of Canterbury directly ordered St. Margaret Clitheroe, a pregnant wife and mother, to be crushed to death under a millstone for the crime of allowing a Catholic priest to offer Mass in her home.
This boring antiCatholic propaganda is so ridiculous and makes you look so uneducated and backward. Why don't you read up on the slaughter of German Catholics by Protestant armies during the Thirty Years' War. Or the massacres perpetrated by the Calvinist Cromwell in Catholic Ireland. Or the slaughter of Polish Catholics by the Protestant Teutonic Knights. Or the church-burnings by the Protestant Know-Nothings in the US. Or the Star Chamber and Tyburn in England. Or the burning of Servetus. Protestants have committed more than their fair share of atrocities and far more Catholics have died at Protestant hands than the other way around.
I'm willing to let it lie. Stop fabricating pretexts to set Christians at one another's throats. Christendom should be united against the Muslim menace - meanwhile you champion antiChristian groups like the Cathars.