Just a few points for mass migration
Morality: leaving babies to drown just so we can save a few pennies is evil. Ageing Europe: Europe is old as fuck we need new young people to increase consumer demand and make our economy more competitive. A mass influx of the most ambitious people from the Arab world would help us compete better, plus you know that whole pension thing.
Fertility: Europeans have stopped having babies, well not entirely most choose to have one or two. That isn't enough to pay for our pension but Arabs have 2 or 3, it will help our demographics.
Diversity: I know some people are racists but if diversity is so bad why is the USA the only super power in the world? Spoiler it's because they take in ideas from all over the globe.
Patriotism: Imagine how much the new citizens and their children will love the country that took them in? Imagine little Muhammad being told by his Mum that they would have been killed but the German government saved them and gave them freedom. He'll be a hardcore German patriot. Same for all countries.
Links with the rising world: It can't hurt for us to have links with the developing world.
Eastern Europe is dying: Eastern Europe is emptying rapidly, migration to west and a low birth rate have left eastern Europe weak and dying. It could again be bumped up with some help from migrants.
Anyone else not scared of le scary brown people and excited at the opportunities they will bring?