>If I were to make a great bio weapon that would do the maximum damage
You must not know much about bioweapons, then. By any measure, SARS-CoV-2 is a very, very poor bioweapon.
Think about it... it infects everyone but for the most part younger people don't die from it or even become incapacitated. It's mostly killing the elderly or people who have pre-existing conditions.
Effectively, SARS-CoV-2 helps the nation that's infected with it prepare for conventional conflict... it leaves younger people able to fight in the military and with some immunity to the weapon, it greatly reduces the need to care for the elderly or those in poor physical condition, freeing up workers for weapons production or logistics.
It's easy to stop this supposed "weapon" from spreading, just social distance and wear a mask... if everyone does it, the attack is ineffective.
Any country that attacked another using SARS-CoV-2 as a weapon would be suiciding. All the virus would accomplish is making the youngest, most able portion of the target population very angry and reducing the number of non combat capable people they have to take care of.
But wait, you say... the US is having a much higher impact from the virus.
That's because our leadership has failed outright and continues to do so at many levels. Calling the virus a hoax, politically motivated re-openings, the support of ignorance instead of science, conspiracy theories... all due to poor leadership.
Which of course is the real reason this tinfoil hat theory that the virus is a weapon hasn't died yet. Convincing a large number of people that it's a weapon would remove responsibility from Trump and the GOP for failing so incredibly badly, or at least make them look better in the run-up to the election.
The truth is that SARS-CoV-2 isn't a weapon, it's a pandemic which the US could have quickly suppressed and defeated, but did not because our corrupt, inept government worships ignorance instead of enlightenment.