In bleak or desolate times, there is a good rule of thumb that has a formal teaching from the founder of the Jesuit order. It is the fifth rule of discernment on knowing what to do in difficult times.
“In time of desolation never to make a change; but to be firm and constant in the resolutions and determination in which one was the day preceding such desolation, or in the determination in which he was in the preceding consolation. Because, as in consolation it is rather the good spirit who guides and counsels us, so in desolation it is the bad, with whose counsels we cannot take a course to decide rightly.”
In other words, avoid making any major changes when you are compromised by a difficult situation. Rather hold fast to what you had before the bad times.
This is really enough said for those that want to limit the more traditional Liturgies for newer ones. And since those newer rites were developed in the “day preceding such desolation”, the availability of both can be seen as a preparation for such bad times.
The rule could also put a lid on those ideas in governments that depend on false flag operations. Causing a bad event to induce a change. An idea that has found historical use in Communism and other tyrannical ideologies. Rather a bad event should be an excuse to hold fast to traditions.