You are the one that seems to have been arguing both sides of the issue. We're all going to die, the sky is falling, there's nothing we can do at this point, etc. and that if we stay in we can totally eliminate all possibility of getting the virus.
Differentiating knee jerk emotional reactions to being objective as possible is not always easy...
If we practice successful personal quarantine measures this infection can be avoided. This is an objectively true statement.
The question is how much our life style needs to change to be successful and whether circumstances will allow for it.
It is not about optimism nor pessimism it is about realism.
It is quite realistic to expect that because of the nature of the USA State/Federal set up that successful mitigation will be unlikely. Some states will do better than others.
So there fore the most likely death toll will be between 200,000 and 2,300,000
The actual result is dependent on how well individual people manage to self quarantine ( physical distancing from droplets using distance, masks, hand hygiene etc ) and how quickly the understand the reality they are facing.
Underestimating this bio-security problem is the key issue facing the world. It has been the case well before the Wuhan outbreak.
Optimism that ignores the science kills people...
Easter Religious activities in the USA will prove my point, no doubt about it...
BTW there are significant parallels to maximum IT security protocols.
The only way to ensure a quarantine exists against computer viruses is to use an enforced Air gap. So the digital information needed to infect a computer can not find any way of entering the system. (aka social/physical distancing)
Maximum high security IT systems must use an air gap firewall other wise they are vulnerable to hacking.