I think a lot of people (in RL as well as on this thread) are completely missing the point.
Illegal immigration is, well, illegal - it's wrong. Whilst I completely get why a lot of people do it, it's still wrong. I can understand why some people commit murder, doesn't make it right though. I think (probably) the vast majority of people can be in agreement about that, no?
The problem with this campaign is two-fold. Firstly it uses the slogan "Go home", which is synonymous with the 70s & 80s racist slogans that were hugely banded about at the time. This invokes unpleasant memories for those at whom these slogans were yelled. It also tells of a much less intolerant society (& one in which I have no wish to return).
The second problem is that the Government is making out that Illegal Immigration is this massive problem that costs x,y & z, huge, blah blah blah. Like I said before, it's exactly like the benefit Scroungers. Big Dave is deflecting our interest onto these "issues" away from the really important things - like the privatisation of the NHS, FSMs being ended, etc etc (vv tired & struggling to think of more, so hopefully someone else will help out here!).
These types of campaigns are purely a PR exercise & it saddens me to think that some people fall for them.