Let's assume Buddism was the ultimate truth of how the Universe work. Would it be Ok for a Buddist to interrupt a debate about criminal law with the remark that, given reincarnation, all murders are an illusion???
People feel inside like they have free will, and they are not going to change that opinion because of your argument. If a men in a white labcoat tells them to disregard their own feelings and surrender to the BigBadCompany, they are not going to do so... they are going to label people in white coats as "manipulative enemy". Furthermore, they are going to label everyone that oppose people in white coats, - antivaxers, prolifers, climate change deniers, etc, - as "potential ally".
So, you want to stop Donald Trump from taking over the world??? Why don't you stop preaching to the choir while alienating everyone else?