Are all scientists leftists? Nope. However, the ones that aren't seem to be called "science deniers" in today's parlance.
As for HCQ, what would actually convince you that it could be a beneficial treatment, and certainly would have been more beneficial than our initial treatment strategies based on these studies:
https://pubmed.ncbi.nlm.nih.gov/33042552/
As for supporting Trump, you're projecting. I acknowledge that Trump got screwed, but Biden is president now and we're still doing the same STUPID shit. Somehow, half the world (all with a lower COVID death rate than the US) used HCQ and Ivermectin as their primary treatments, and there is significant evidence that the treatments were beneficial. Are they perfect? Nope, but like you said, no treatment is (including the Vaccine). But because of political expedience, its become easier to simply mock and name-call outside opinions rather than actually address them with science. See the FDA tweet below as a clear example of such disdain and malfeasance:
As if the FDA didn't know that Ivermectin had been prescribed for YEARS to humans, or that it was the primary treatment for bringing India's raging Covid outbreak under control this summer. Those facts are inconvenient to today's scientists. Whether that's due to political ideology, or simply indicative of the absolute strength of the Big Pharma lobby, I don't know, but its clear as day that we are deliberately choosing to ignore and ostracize (rather than investigate) any alternatives to our current Covid strategies.