As I have written before, Summorum Pontificum had basically gifted the Traditional Latin Mass to the Traditionalists, in effect giving the Trads authority over the bishops. If someone wanted a Latin Mass, they merely had to go to the pastor of a church, who was obligated to accommodate them. The only time a bishop got involved is if the pastor denied the request. The bishop was then required to accommodate the Trads, and if he couldn't or wouldn't, the matter would go to Ecclesia Dei.
From Summorum Pontificum:
Art. 5, §1 In parishes where a group of the faithful attached to the previous liturgical tradition stably exists, the parish priest should willingly accede to their requests to celebrate Holy Mass according to the rite of the 1962 Roman Missal. He should ensure that the good of these members of the faithful is harmonized with the ordinary pastoral care of the parish, under the governance of the bishop in accordance with Canon 392, avoiding discord and favouring the unity of the whole Church.
Art. 7. If a group of the lay faithful, as mentioned in Art. 5, §1, has not been granted its requests by the parish priest, it should inform the diocesan bishop. The bishop is earnestly requested to satisfy their desire. If he does not wish to provide for such celebration, the matter should be referred to the Pontifical Commission Ecclesia Dei.
Art. 8. A bishop who wishes to provide for such requests of the lay faithful, but is prevented by various reasons from doing so, can refer the matter to the Pontifical Commission Ecclesia Dei, which will offer him counsel and assistance.
Pope Benedict XVI's actions were really unprecedented. I don't think you will ever find an instance in all the 2000 years of Church history where priests and bishops were so completely sidelined and stripped of their authority and the laity was allowed to make unilateral decisions apart from the rest of the Church. Pope Benedict, in effect, turned the authority of the Church upside down. The Traditionalists were put in charge with no supervision whatsoever.
Instead of being grateful and humble, the Trads felt emboldened. They felt invincible. They believed that they are divinely entitled to the freedom given to them by Pope Benedict, and no one, not even a Pope, has the authority to deprive them of that right.
Not only were the Trads given carte blanche with the Mass, they were allowed to use the older form of all seven sacraments. Entire churches were taken over by traditional orders as they traveled back in time to the 1950's. The post conciliar Catholic Church had no relevance in their world.