I bet that plenty of people have ideas, and many of them are pushing them through social media and other forms of publicity. There is a painful reality that seems to elude way too many people. Hashem did not consult with us mortals before arranging His hashgocho protis. We also lack the neviim to explain to us exactly what we need to know about the Divine cheshbonos. This is true for every single event since we last had these baalei Ruach Hakodesh. So we are limited in being unable to honestly declare the causes for these major events, whether mass shootings, terror attacks, pandemics, etc. All we can do is to examine ourselves and make tikunim in our lives to be better at our Avodas Hashem. None of know the specifics of our tafkid in our very existence. What we do know is that we have a Torah with 613 mitzvos, and Oral Torah that provides us with any other specifics in how to conduct our lives, and countless seforim that bring all that to our level to make direct applications in our lives. What is right for me might not be the same for you. For this, we need a spiritual guide, as in עשה לך רב, and to develop the skill of חשבון הנפש, where we can fearlessly look inside to see what we need to fix or where to improve. Headlines and Whatsapp messages cannot accomplish this.
We can reasonably say that when this is over, we should do something to make our experiences in yeshivos, batei medrash, simchos something more spiritual. What those specifics may be should be with the guidance of our morei d’asra, our Rav, and our personal introspection. It is reasonable to seek to reset our Avodas Hashem, both public and personal aspects of it. But the delving into what caused it, or why is fruitless, and a general waste of time. Perhaps even arrogant to believe we can identify the intention of HKB”H in how He runs the world.