There is no country in the world that allows uncontrolled, unrestricted immigration.
No British party advocates that either.
That does not make them all racist.
The problem is that our respectable parties will not talk about acceptable levels or how they could be enforced.

That is how BNP, with its very unBritish values and ideas, are able to gain support in areas of high immigration.
It is too easy for those of us outside those areas to pass judgement on them.