You semi-misunderstand.
A lot of liberals understood and believe this virus was man-made. As a progressive who lost from it, I'm an example of just that sort of thing.
What a lot of liberals wanted to prevent, however, was the cult's knee-jerk reactions to their Puppet Master's words.
Covid fueled Racism is a thing. A horrible thing that logical people could sidestep, but we weren't dealing with logical people back then, were we? People who take umbrage over attempts to save their lives.
More over, this is the plague of our lifetimes, and Trump made it into a racial slur. More over did he deny it was anything and pretended it was going to magically fade away and no one was going to suffer because of it.
In short, Trump took every avenue to make this situation the absolute worse it could possibly be. Like I've said before, if Trump took it seriously and did what he could to save lives, I wouldn't have minded if he was re-elected. He would have at least shown leadership. However, he stoked racial hatred and made it policy to put us at risk.
And that's why I took the 'opposite stance'. Because it was the only logical stance to take.