As children, we are told to "Never ever accept sweets or anything from complete strangers !" . . . . .
However, whenever the Doctor, a complete stranger who's name we don't know and never will know, offers someone a Jelly Baby, no one seems to care what so ever.
It never used to bother me that people would accept Jelly Babies from the Doctor, but considering we don't know his real name, it is a bit worrying to me now, after all, would you accept a Jelly Baby from a 40-ish looking bloke with crazy eyes, curly hair, wearing a long multi-coloured Scarf if you met him on the street and you have absolutely no idea who he is ? . . . . . nope, didn't think so.