I'm sorry, this is about safety. Obviously if you rapidly rub your emergency key card against someone's bare skin, the offended party may end up with an injury similar to a rug burn, or heaven forbid, a deep scratch. Who knows what demands the flight crew will give in to considering that horrible prospect? Do you want to take that chance? You should feel fortunate that there are people concerned enough to care.

(Public Service Message: the comment above is heavily laden with sarcasm.)

Now, I, on the other hand have been rightfully chastised for attempting to bring a manifestly dangerous item on board. Several weeks ago, I was a gate "selectee" in EWR, and upon inspection of my items, the offending article was confiscated over my half-hearted protests. The item: a standard paper clip. I was duly informed with all sincerity that I could have straightened the clip out and then use it as a weapon. (The security official must have been confused me with James Bond or MacGyver) Little did I know what power I had wielded over the last 500,000+ miles with that little paper clip in my travel notebook.

Once again, remember it is all about safety! Happy flying! (if you can get past "security")

CWPFLY