Recognized immunologists have argued that their favorite unproven treatment is the best.

I know plenty of anti-vax, some of them remarkably smart, some of them are health professionals.

We are all biased, and overcoming bias is hard. It is a field of expertise by itself, and it is usually not required for tech jobs. Just being smart will only allow you to find more complex but just as fallacious arguments that will confirm your bias. For example, it took me a while to "believe" in climate change, I took a while to realize that solar panels are not just for pocket calculators, and things like that, for a variety of reasons, and found a lot of advanced material to fuel my bias, which still has not completely disappeared. I am not particularly attached to Ivermectin so there is no bias for me to overcome, but I understand that some people can be. Try to think about it yourself, you probably believe in stupid things too.

And getting attached to a cheap treatment for a disease that has been messing with our lives since early 2020 is not what I would consider an unhealthy reaction. It is hope. Getting too attached to it can be a problem, but no matter what we want to think, we are just humans.