The lefties have to justify their demented support for an immigration policy that's as open-door as possible. Making out that the current population of The UK somehow owes something for the perceived 'sins' of their forefathers is how they do it.
What they are too slow to realise is, that only the elite and those at the top benefitted in past centuries. Now, it's only the working/lower middle class that suffer the effects of poorly controlled immigration. The lefties obviously despise ordinary, hard working people in this country, because they are always the ones who lose out the most.
Historically, do you believe that 'lefties' have always been in favour of immigration?
How do you define, for example, big business in terms of left and right?
http://www.cityam.com/blog/1386583244/business-leaders-speak-out-support-immigration