It's ridiculous that a lot of immigrants don't work in Europe (if true). Isn't the point of immigration to find greater opportunities (read: better jobs) in other lands?
What do you mean by 'immigrants'? Most post-war/post-decolonisation/etc immigrants did move to whatever country for work and usually found it. That was forty, fifty years ago in most countries, back during the long lost 'Golden Age of Capitalism'. Most of those jobs have gone, which is why these communities have such high unemployment rates. Most members of these communities have difficulties finding new work because they are generally unskilled and usually have few decent qualifications. There are also issues with labour market regulations and so on in some countries and various nightmarish housing and transport problems in others. This is not a problem of immigration, except indirectly, but is a massive contributor to various... er... problems of 'community cohesion'... yes... that seems like a functional euphemism.
I was talking about mainly new immigrants not working and living of the welfare state (again I am not sure how high this number actually is, or if the "problem" is just an exaggeration), rather than immigrants of past who may have become unemployed due to economic circumstances.
I guess it's different in Britain than it is in Sweden and some other countries where there might have been more recent immigration?