Accutely relevant these days, with the refugee crisis!
War refugees - yes, economic migrants - no.
Men mange nordmenn er uenige!
Why is inserting the å wrong here?
In Norwegian the infinitive "å" is dropped after an auxilliary, in this case after "vil".
In English, these are modal verbs: must, will, can, etc. The grammar is the same as in Norwegian: we drop the "to" immediately after them.
Why onsker and not vil ?
You can use either, but if you opt for "vil" you must omit the infinitive marker ("å").
slutte is not possible?
It would be a peculiar word choice in this context. You would use it if talking about closing circuits, or closing a circle; it's more about making the connection complete, rather than closing something out.