See Wagenmaker's et al "Why psychologists must change the way they analyze data: the case of psy" for why the Bem results are simply artifacts of bad method and statistics. Pdf here.
The methods that Bem uses in his experimentation itself has been viewed as controversial as well. According to understood statistical methodology, Bem incorrectly provides one-sided p values when he should have used a two-sided p values.[17] This could possibly account for the marginally significant results that he produced in his experiment. A rebuttal to the Wagenmakers et al. critique by Bem and two statisticians was subsequently published in the Journal of Personality and Social Psychology.[18]
When I have seen back-and-forths like this it's...
[Post redacted 'cuz I unfairly and carelessly misrepresented someone's views (Eliezer's). The messages of this post was: disbelief that aliens visit Earth in spaceships is a bad reason not to look into ufology. My apologies for this ugly post.]