Much public discussion about immigration, including much of the print and broadcast media, negates rather than promotes understanding. The most obvious example is that polling companies still ask voters whether they think immigration is too high, and those in the media treat the results of those polls as indicative of what voters really think. As a result, much media discussion about immigration views it as a problem, and the solution involves reducing the number of immigrants coming to the UK.
Why do I think that negates understanding? In my view it is like asking voters whether they think taxes are too high, and then framing all public discussion of taxation around how to get taxes down. With taxes we know (now at least) better than that. The right question to ask is whether people want lower taxes and lower public spending, because the two go together. If I do a google search for polls about whether taxes are too high, most results present voters with that tax/public spending trade-off. The opposite is also true. Asking politicians how they would pay for additional public spending has become ubiquitous (although less so for Conservative politicians who want to cut taxes).
If we exclude asylum seekers, students and dependents, then most immigration today involves people coming to the UK to do specific jobs. Making it more difficult for firms to employ immigrants would have consequences, just like reducing taxes has consequences. This is why, when voters are asked about skilled immigrants, they have substantially more favourable views than for immigration in general. Furthermore, although voters want less rather than more low skilled immigration, when specific occupations are mentioned that antagonism is substantially reduced. As Stephen Bush noted recently, there is public dismay at the recent drop in immigrants