That wouldn't be your attitude if they were pushing a new vaccine mandate. You'd be opposed to it before all the facts come in. I don't think that's because you want to be on the "good" side. Similarly, I'm not opposed to what they're doing in Iran to feel good and I don't think that's a fair criticism. Iran has been the Neocons' target, publicly, for 30 years, with all the other disasters being precursors to it. Considering the same people who championed those are championing this, I don't see how it's different than if Fauci came out with another experimental injection for all of us.
It's fine to be opposed to something based on principles and experience before all the facts are known (which they won't/can't ever be, as you also discussed). Just like with the jabs, you can say "Based on what they've offered as justification, this is not a good idea." Maybe things work out totally differently and there were unstated motives, but that's not relevant to how we make decisions about the future.