Don't deontologists believe you're deontologically barred from destroying the world? You seem to have given an example where deontologists and consequentialists would disagree about the moral course of action, and then stated that obviously you should do the thing dictated by consequentialism because the consequences will be better. Look, I'm inclined to agree with consequentialism, but there are deontologists. They believe you shouldn't pull the lever in the trolley problem even though if you do pull it fewer people will die. Immanuel Kant really believed that you should never lie, even if lying would save a life. I'm not sure if your actual point is that no rationalist should be a deontologist and so we shouldn't discuss deontological arguments or something like that, but there are deontologists and they really do believe that people shouldn't personally do bad things even if those bad things result in better outcomes. It seems inaccurate or disingenuous to claim that no one espouses or believes this well known moral viewpoint, even if we personally disagree with it.