"I thought the Hmong were a gentle and peace loving folk "
Most are. Let's see: We have black gangs, Hispanic gangs, Vietnamese Gangs, Hmong gangs, skinhead gangs.
A certain percentage of youths end up in gangs. The Hmong are no exception.
OTOH, there's a Hmong family down the street about three doors. Their teenaged kids are very nice, helping the elderly residents on our block with snow removal, etc. The parents are also friendly, and welcomed my wife and I to the neighborhood with a tray of absolutely delicious spring rolls. All speak excellent English. The only exception is the grandmother, or great-grandmother (it's hard to tell). She speaks only Hmong, but always says hello in Hmong whenever I see her.
Sorry, but I refuse to blame an entire emigrant community for the actions of some of its members. I'm funny that way.
What, you mean holding individuals responsible for their own actions?