As for being treated 'badly' - how would the Indian police have handled the same situation? With these guys sporting stereotypical BinLaden-style beards and behaving like they did, one can understand the concerns of the other pasengers, especially with the ongoing terror alerts regarding Paki terrorists - how does a firangi tell Paki from Indian - to them all South Asians looks alike. It's an open secret that the behavior of South Asians leave a lot to be desired, usally prompting one to wonder which zoo they've just been released from. Also, the behavior of the detainees seems a bit out of whack for folks who said they've been travelling around the world for years selling their garments or whatever - surely they must know to put on their seatbelts, unless they just wanted to be obstreperous and obdurate, just to tell folks that they are there, like African-Americans talking very loud at malls and other public places - the you-can't-ignore-me syndrome?
