The worst case I recently was made aware of shed light upon the biggest issue, IMO.
A 41-year old diabetic man spent 3 months in literal isolation because his doctor said directly to him that he "can not get this virus, or it will lead to serious outcomes". So, he spent the the time from that point, a literal prisoner in his home.
Because of the loosening of restrictions, and the seeming decline in cases, he deemed it somewhat safe to attend his own mother's birthday party a couple weeks ago. Attending that same party was a younger cousin in his 20's, who had KNOWINGLY tested positive 5 days prior, but had not developed any symptoms, and basically just figured "whatever, not a big deal". Otherwise known as a "Covidiot".
I think you can figure out what happened.
The diabetic man started feeling off, and went to the doctor, and tested positive. He was admitted to hospital within 48 hours and suffered multiple organ failure within days. He died a few days ago, 24 hours after he posted his last "Gonna fight this" Facebook message.
People simply saying "meh, whatever." . If America has proven one thing in the past 5 months, it is this: We have proven we don't truly care about anyone or anything other than ourselves. And by "ourselves" I mean each individual in a literal sense; it has become abundantly obvious that Americans don't even care about the welfare of other Americans. Our fierce individuality has manifested itself as a handicap to this threat.
Some will simply dismiss it out of hand, some don't have the mental capacity to understand.... and some still think that they can't die. Some will even point to his diabetes, and disgustingly say "well there's the reason, he had a co-morbidity", like having a livable condition somehow should mark you for death today. Meanwhile, the rest of the world is coming out of it, due to a reasoned, research-backed response that dealt with what the virus needed at a basal level.... human bodies. Without bodies, any virus cannot replicate and therefore won't survive. We are about to go straight back into a full lockdown because half our population refuses to believe science, while the rest of the Western World are having celebrations for beating it.