Maybe we can't really change what they're doing, so I guess that's why I can't really say this thread is really helpful (the point about showing why we don't do some of these things, though, is a good reason for it, I guess).
I just want to say in response to all the posts saying "We shouldn't think of them badly because they do this, it's just their way of life" :
I'm a Sikh because I think Sikhism is the best religion; sure, let them believe what they want, maybe, and we should let them accept it, but I still think it's weird/pointless/not good for you in any way, and shouldn't we believe that if we're to believe our religion is the best? Or are we just following the religion because our parents did... I dunno, this is a weird thread nevertheless...