Multiculturalism

Considering the problems it has been shown to cause, is it worth it?

In b4 racists, stormfags and anyone with a prejudiced opinion and little else.

The 'it's for the economy' excuse is used by the government in the UK, which gives the assumption that immigration is allowed for the fiscal good of the nation. However, somehow I doubt the economic advantages of immigration outweigh the damage caused by police hours and justice system resources wasted in the rising crime rates, child support for huge families created by overbreeding 3rd world immigrants, highly expensive medical treatment for inbreeding Pakistani and other incestuous cultures' (literally) retarded children, money being sent abroad by foreign workers to their families outside the UK, educational courses set up to accomodate foreign workers with the language etc, and probably some other expenses I can't recall now.

Obviously this post is highly biased against the huge levels of immigration the UK is experiencing right now, but I really would welcome any genuine arguments against my points to get a clearer picture of the issue.