I agree that we can't know why for sure, but I think we can take an educated guess. I never paid much attention to the book of Zechariah until 2 weeks ago. There's a partial verse in ch.11 that made me sit up, read much slower, and I'm still wondering if what Zechariah said back then has a special meaning for us today, with this virus. I think so but it's nothing we don't already know. Basically Zechariah was telling the people of his time that if they obeyed the Mosaic Law and behaved as good Jews that then the Messiah would come sooner and things would go better for the 2nd Temple Israel. So when I apply that to us I get that if we'd all behave as righteously as possible that then this virus would harm less people and the quicker we'll be rid of it. But I already thought that was true. For me, reading Zechariah was conformation of what I already thought.I think we can't know "why" because God's plan is beyond our comprehension.