People, what does this have to do with anything? TAPOUT t-shirts, bouncing in bars...are any of you so confused that you can't tell the difference between practice on the mat and pinning Joe Random I-Don't-Know-You who tried to get wrong with you? I don't think so! If someone taps, and you release OR NOT, either way it's a choice, it's YOUR choice. Please don't tell me that you're studying a martial art and you don't have the mental acuity to recognize your situation and make an appropriate choice accordingly.
It is very hard to choose when you are scared. More likely you fall back on habit and training. Very seldom have I seen a dojo where they practice not letting go when someone taps as a valid thing to do.
The evil seminar sensei is exactly right, but for all the wrong reasons.