Science is a process, not a knowledge base. It is in fact the best process we have of arriving at accurate answers. Flushing may or may not be good practice, but attacking science in defense of flushing is foolish. If your motivation for flushing is that the plant absorbed 'foul tasting chemical nutes', then you need to learn about chemistry. All nutes are chemicals. I am willing to believe that naturally derived nutes have a different effect on taste than synthetic, but I wont believe it based on some misunderstanding of what the world organic means, and I have seen nothing in this thread aside from conjecture, logical fallacies and ad hominem attacks in support of the view.
A bad argument is not made any better by attacking the standards which make the argument bad. The problem here is the defense is one of an ideology rather than actual knowledge.