On the one hand, I get the Biden campaign pulling their ads. It'll be a good reminder for voters of the stable, compassionate alternative to the insanity and cruelty that is this administration. Plus, there's only about a month left to go until the election, people are already voting as it is, and I doubt there's really much else they could say or do to further convince people to vote for them at this point. It seems pretty clear that the vast majority of Americans have already made up their minds by now, and if the Trump campaign is hoping this will bring them sympathy from any voters that aren't part of his base, I think they're fooling themselves. Just look at how many people have spent the day a) mocking Trump for getting sick and even outright celebrating it, or b) questioning whether or not they can believe he's actually sick.
On the other hand, considering Trump's campaign's refusing to back down, and considering how they pulled no punches both in 2016 and now, I also totally get and can't disagree with the whole, "Screw being polite and classy, just let him and the party have it" attitude, too. As I said above, he brought this sickness on himself, and it's a sickness he's put others at risk of getting, and he's still got a ton of damage and death on his hands. We shouldn't ignore al of that in some admirable yet iffy decision to be "polite and respectful". People were cheering Biden for finally telling Trump to shut up at the debate the other night, so I don't think many would complain too much here, either.