If there was a person on the planet that could read any company's SEC filings, press releases, transcripts, etc., and use that information to consistently and regularly buy and sell securities (or anything else), wouldn't that person eventually become infinitely wealthy?
Blame that portion on me. That's the way I invest. There have been many very successful investors that do much more research than me.
Where everyone goes wrong in investing is that our thesis can be flawed. I'm not a Keynesian but I always try to keep one of his quotes in mind: When my information changes, I alter my conclusions. What do you do, sir?" Where many make their mistake is doublng (or even tripling) down on an investment that isn't working. I've certainly been guilty of that and I don't think you'll find an honest investor that claim otherwise. We all pick some losers.