I totally agree Pip. Extreme times result in extreme politics. So, better to avoid the situation in the first place.
M Howard said something along the lines of "Rather than ignore extremist parties, we must prove to the people that their propaganda has no basis." If overimmigration caused no problems, people wouldn't have a problem with it. Also, it is something that is a lot easier to solve than the other problems we face (and is also part of the cause of some of the other problems).
The most tragic thing is, there are people in the world who NEED our support, but they won't get it because we are wasting our efforts on people who have no need, just they want to live in a country where cars have airconditioning and we have big tellies (a trivialisation, but that is what it is... trading an acceptable standard of living for a slightly higher one, at the expense of others).