Oh I dunno. I would take the other side of that argument. Ohio has a pantload of delegates and is seriously, seriously in play as a swing state. (or has been). There is not presidential candidate who would not give his left nut to lock that state down as hard as possible.
I wonder more about what the hell he thinks he is doing by ignoring them for so long rather than wonder why he is doing. Joe, what the hell are you doing?
And castastrophes tend to put everyone on the same team in a state regardless of differences and there are lots on independent voters in every state. For an Ohioan - red or blue- to look over and see that the president (and Buttigieg for the longest time) did not share their pain and show up when it counted the most has a real dirty look to it.
Trump will probably show up there again after/if Biden goes. Bubba Clinton would have gone and not have been able to finish his speech because he was crying so much, and then go bowling with a couple of them later. (Bubba used to tell all his campaign workers that they showed up in a town too late in the day to canvass, don't just go to bed because the bowling alleys are always open and you can talk to the people there, heh, funny dat).