Understood, but I think you need to know that the math does not support an inordinate fear of counting errors. And as far as I'm concerned, if the math doesn't support something, I'm not interested in it.
You're right that your emotions can get the best of you in this game. Believe me when I tell you that when it does, it's because you're overbetting and no other reason. Losing 100 units is a laugh when you have 2000 units in your pocket.
You can very easily lead yourself into superstition by neglecting to keep the quantitative aspect of every element of the game in perspective. Yes, missing a card causes loss rather than profit, but how much loss? Did you know that when we split 10's, it really does hurt the table? On this shoe and usually on the next one too? And that you really can get an advantage in some games by playing a progression? It's true! All these things are supported by the math , if you consider a 0.01% change in advantage to be worth investigating. These are all things commonly recognized as superstition that someone might think was viable strategy if I didn't say how small these effects are, and believing that avoiding all counting mistakes can provide a worthwhile benefit to the game is also, sorry to disappoint anyone, a superstition.
Regarding the title of this post, some of the discussion here reminds me of some old mouthwash ads stating "Your best friends won't tell you," referring to having bad breath. We can't tell when we have bad breath, and most people will not tell another person that they have it. So upon seeing this ad, some people would be tormented by the fear that they themselves may have bad breath and they have no way of knowing, so they go out and buy the mouthwash.
The simile that I'm trying to get at is that if someone were trying to sell you a product supposed to prevent you from making counting errors, they will oversell the effect of these errors ("You will be secretly hated if you have bad breath!"), convince you that you have no way of knowing that you make the errors ("Your best friends won't tell you!") and then offer you a solution.