There are lots of small informal networks of cannabis growers and consumers here in British Columbia.  

Some of those networks are ethnic based but do not constitute 'gangs'.

A lot of cannabis is sold through 'triangles' where Hells Angels occupy the top and a large number of unaffiliated individuals and small, informal networks operate below.  Why you ask are ordinary citizens willing to get involved directly or indirectly?   Security.

In fact, the cannabis trade in BC is probably is more peaceful and secure thanks to the involvement of the Hells Angels.

Lots of ordinary folks in BC are very happy to live in a neighbourhood with patched members present.  Why?  The received wisdom is that patched members keep the neighbourhood safer from crime.  

If any of the above is found to be somehow objectionable or worrisome, then lobby your MP to accelerate the legalization and regulation of the cannabis trade.