Are There Any Honest People Who Doubt the Possibility of ETs Visting the Earth Manifested as UFOs?

I ask, because online, there seem to be a fair number of people who just flat-out deny the possibility of UFOs being ETs. How on earth is this an honest position? At best, you could doubt it, but still hold it out as a reasonable possibility. But to flat out deny it? That is a shill position... but it always amazes me how many shills you encounter online regarding any sort of "conspiracy issue".