The problem for UFO skeptics is that while many of their natural phenomena explanations are reasonable and plausible, on the particulars, those explanations are often conjectural and inconclusive and sometimes rely on what is otherwise regarded as fringe science. The UFO subject remains fascinating in no small part because the better advocates and skeptics are all pushing against the mainstream in taking up the subject, attentive to the evidence and to scientific and technical issues, and careful in their arguments. Many UFO skeptics are believers in the possibility of UFOs as ET visitors, and many UFO researchers are fierce debunkers of much supposed UFO evidence.
Like for instance?
I don't deny that there are good skeptics and poor ones. My point was that Klass was a skeptic who debunked many UFO reports through the use of basic, mainstream science.
The ET explanation for UFOs is most certainly an extraordinary claim and hence, requires extraordinary proof. Klass merely pointed out how far from that standard the believers of same were.