Why is conventional current still taught in school when it is unreal, given that real current flow is electron flow?
Given that a fundamental goal of science is the pursuit of truth, why
  doesn't electrical engineering text books abandon the concept of
  conventional current and embrace electron current?


There is no cover-up. Every text book I've seen that has merit talks about current flow and electron flow.


  Why is conventional current still taught in school when it is unreal,
  given that real current flow is electron flow?



Conventional current flow is what it is - get used to it.
Conventional current is not unreal - get used to it.



  Real current flow is electron flow



No it isn't - get used to it.