Ian, well the bees are not being driven to extinction: there are
  fewer beekeepers. Statistics depended upon beekeeping as a
  hobby. Beekeeping has become less popular and with fewer people
  counting the bees, there seems to be fewer bees.

  I work in animal trapping and one of the things we deal with is
  bees. There's no bee shortage but there is DEFINITELY a growing
  shortage of beekeepers. We used to be able to "trap live bees"
  because we'd just pass it on to a local beekeeper. But over the
  past 12 years, fewer and fewer people bother with it; beekeepers
  get old and die and their grandkids don't share the passion.

  We have ONE GUY left that we can turn to. But he's old himself
  and eventually we'll have to change our literature and no longer
  be able to help people by removing bees nests live.

  Mix in a story linked to the drug that caused birth defects that
  were extremely scary and real (and I could've been a victim of
  it myself, had I been carried a few months or a year earlier
  than I was)... and mentally link it to _suspected_ pesticide
  pollutants (DDT) that, as far as I know, ended up being
  disproven.. but once the ball got rolling, its hard to stop an
  idea from the public mind.... and toss in a few big name
  chemical companies.... you get a spreadable meme.

  Agent Orange was:
  [1]https://en.wikipedia.org/.../2,4,5-Trichlorophenoxyacetic...
  and
  [2]https://en.wikipedia.org/wiki/2,4-Dichlorophenoxyacetic_acid

  Thalidomide is not known to be a carcinogen, although they're
  revisiting the possibility of a particular type of cancer, due
  to growing concerns likely fed by grassroots media efforts. (my
  opinion)
  [3]https://en.wikipedia.org/wiki/Thalidomide#Carcinogenicity

References

  Visible links
  1. https://en.wikipedia.org/wiki/2,4,5-Trichlorophenoxyacetic_acid
  2. https://en.wikipedia.org/wiki/2,4-Dichlorophenoxyacetic_acid
  3. https://en.wikipedia.org/wiki/Thalidomide#Carcinogenicity