These are views distorted by prejudice. Official, scientifically derived, figures for statistical significance of unexplained cases are very high, 21% and 25%. There were two professional studies funded by governments of US and France. US study, with a team of 4-5 people was lead by astronomer Alan Hynek. French study, known as GEPAN, was lead by physicist Dr Claud Poher. Both studies came up with farely similar ball park figure for statistical significance unexplaine of cases, between 20-25%.
It is important that, in science, anything below statistical significance of 5% is considered as a random noise. But 20% is four times higher than 5%, so it means that scientifically speaking UFOs are not to be ignored.
It's only that results of these studies were interpreted,not by scientists, but by politicians and civil servants who blended them with mainstream agenda of the day.