People are scared.
People are scared.
These events just exponentially multiply community transmission so while everyone there might be 30ish and just gets a bad flu, the bigger point is that they are spreading it to their communities at home and disproportionately at-risk populations.
It might actually just be public-spiritedness.
I was at PAX East over the weekend with a 100,000 strong cohort of people who aren't exactly well known for personal hygiene and I wasn't scared, but it probably wasn't the ideal place to go. As long as you take strong precautions (cleaning shared surfaces aggressively, using hand sanitizer or washing hands after touching shared surfaces or people, avoiding sick people, avoiding confined spaces, etc) then I don't think there is really that much risk short of being coughed on by someone, but not much risk != basically no risk if you don't go. I actually went with a friend who was sick with the common cold and I was more concerned about him getting me sick than me getting COVID-19, and it seems I managed to avoid both.
PAX East basically only happened IMO because it was already in motion by the time the COVID-19 concerns really blew up. Ironically, the early date that no one was happy with probably saved the convention.
If it was being held even this week, much less in a few weeks like GDC was supposed to be, I'd expect widespread exhibitor cancellations and likely event cancellation.
Unfortunately I don't think you'll know for sure if you got sick for at least a few more days. For COVID-19, I think there is a 5-7 day period where you can show no symptoms (but still pass it on to other people.) And even for the regular cold/flu, it can take a couple days for symptoms to show up.
I agree with everything else you said though; wash your hands often, use hand sanitizer, bring lysol/clorox wipes with you and wipe down any shared surfaces if possible.
If even Xi Jinping doesn't have the political cover to pull it off, the US political leadership surely won't.
(speaking as someone who's been on both the attendee and organiser side of the convention 'fence')
Nerds be gross, my dude.
Then people could wash their hands immediately after wiping, instead of first having to touch other objects like pants, belts, and in public restrooms, jackets, backpacks, and stall latches.
Even if you do catch it now in the US, if you're not very old or have other health issues, the healthcare system has enough slack space to treat you (potentially crippling debt afterwards notwithstanding), and you'll almost certainly be fine. This may not be the case in the coming months and years, but it's difficult to predict how things will progress (considering there could possibly be vaccines and anti-virals that arrive in time to prevent a full US epidemic).
If one of those 100,000 people had the thing then by now many many more of them have it and are now vectors.
Paraphrasing Lord Humungus, "Just stay home. Stay home for a few months and there will be and end to the horror. Just stay home." (The bad guys are the virus, the good guys and their gas is your health, and Mad Max is the guy cancelling your event. It's an imperfect metaphor.)
"Just Walk Away" Mad Max 2 - The Lord Humungus https://www.youtube.com/watch?v=ZfL4xKQeSfo
Imagine if we had a news/media blackout for a month - life would be so much better overall that you appreciate why so many just avoid social media, a label that is so far removed from the social aspect that it is literally fear/hate media platforms for the extremes in life, whatever side of the fence they sit.
If people panicking leads to people watching more news, the news companies will let it happen.
Besides, these people have to put food in the table somehow. Asking them to just stop working because their work is ethically compromised would raise various issues.