Anyone can cherry pick 'facts' to suit his own emotional bias.
This is very true. It's true of us all (and not just wrt investing -- life in general!) Many people recognize this in others but we all find it inherently difficult to recognize it in ourselves. Just recognizing it will often put you ahead of the game! (I am speaking in very general terms here.)
So perhaps the real battle is learning to calibrate ones tendencies for emotional bias.
Yes. This is a hugely important, difficult battle! Requires discipline. Discipline is what I rarely see in those who post about TA. Their predictions are imprecise and posed in a manner such that whatever happens, they can say "yeah I predicted that." Very often, a long winded post will boil down to this:
"If the price drops, then [insert fancy TA terminology] and it will drop some more. But if the price goes up, then [insert some more fancy TA terminology] it will go up some more." The result is that the person ends up chasing the market: all too often, buying AFTER the rise, selling AFTER the fall.
Solution: make your predictions specific, unambiguous. The more you discipline yourself along these lines, the better.