Immigration and vote getting are always tied in,just look at the policies at the turn of the last century.
One Americian commentator blamed it on TV and air-conditioning,and he made a strong case.
I grew up around Vancouver and I mourn the loss of that safe and civil society.
There has always been gangs,wheither Chinese triad or Italian mafa.But since drugs,there much more street level volence.(sp)
I don't have an answer,but blaming politians is much too easy.