I don't know any Sudanese but, from what I've read (and we all give/have given opinions on what we've read) I'm not of the opinion that the majority landing here illegally are fully qualified doctors, engineers, professionals in any way, otherwise they could go the legal route.
Their culture is not Western culture, in the main, however, if reports in the media are anything to go by, a lot of them land in trouble when arriving illegally here or in other countries.
We have enough trouble with our own troublemakers without accepting illegal immigrants who do not go through the proper channels.
Even the Isle of Man (with the exception of certain seasonal workers) only allows you to work if positions cannot be filled from the island population and there is rigorous checking, you have to be sponsored by your future employer and both if you have to go before a board and answer questions to which the board already know the answers, so there is no fooling them.
If a small island can do that, we, compared to other countries are small and should also go that route.
Canada, Australia and New Zealand, to name three other countries, have vigorous checks in place.
What will happen to the countries they leave? Only women and children left and who will provide for them? We can't go on like this. There has to be a point where enough is enough.