"Correction" in the Dow is probably not the term.
Your right this isn't historic. Travel is being banned, store shelves are empty, schools are closing, all major sports have stopped play, governors are prohibiting all events with crowds exceeding a certain number of people, I could go on and on. But this happens all the time right, nothing to see here.
I'm not saying any of this is necessary or not but it is without a doubt historic.
Those retired and living in the country can ignore all this all they want. But for those like myself living in a big city and having a job that requires going into densely populated households and having body to body contact numerous times each day it's a bit different. I'm not afraid for myself, but I sure as hell don't want to bring this back to my family and especially the older and/or sick ones.