I've never heard of a flight going down because of someone's little device confused the plane and made it crash. The reason we have these rules is because the people who write them are old and afraid of everything. One time I was sending a text message right after landing, while we were just rolling to the terminal. The guy next to me started freaking out getting all ****ed at me, saying hes a powerful man and he can have me 'taken care of'. I thought it was so rediculous! I walked away while he yelled at me in the terminal... really strange. What was I gonna blow the plane up or something? Accidentally initiate the self-destruct sequence?
It's just because he saw my little phone with the little keyboard and got all freaked out about 'radio interference'. Good God!