The Pope has universal jurisdiction over the whole Church. To be united to him is necessary for salvation. He is the supreme judge of the Church and it belongs to him to decide who is in communion with him and who is not. Even though his decisions are not always infallible, he enjoys the favour of law.
Any community has a common good.
In order to overcome this dangerous situation actions are lawful which are not permitted without this state of emergency. Never in Church history, there has been such a number of widespread heresies. Many of these heresies are even proposed by Catholic priests and bishops. Liberalism, a notion of Religious Liberty already condemned by previous Popes, Modernism, and other errors already condemned by the Church are largely influencing the faith of millions of Catholics. This clearly is a state of emergency in the Catholic Church, which cannot be overcome by ordinary means.