One thing I will never understand is why leftists (or should I say "leftists") are so pro mass immigration...
Mass immigration is basically modern day slavery, a ploy to depress wages of the native population, stiffle social mobility and destroy unions and workers rights by concentrating people of vastly different cultures, languages and religions in the same production areas, people who more often than not truly hate each other, a classic divide et impera strategy. On top of that mass immigration deprives the country of origin of the people most likely to succeed, impoverishing and weakening them, keeping them exploitable by mega corps.

It's like leftist cannot into their own ideology