I don't know how much this goes on, or the extent of it, but-
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/love-and-marriage/32842-sikh-girls.html
Sikh girls have a brain of their own, if they're willing to make such a life-changing decision as converting their religion without finding out everything about that religion and about their partner then * them.
Sikhism from what I understand isn't about making numbers, it's not like "oh no we lost one more sikh girl". Losing someone who is just a sikh by name means nothing really. All these girls (and boys) have brains of their own. Their parents are partly to blame for not educating them correctly, but once you grow up you make your own choices and have the ability to research for yourself.