This Trudeau guy seems to have the right idea, given how it's single young men who usually become a problem. Considering how the majority of the migrants are single young men, barring them from entering Europe and deporting the ones already here would also solve the uncontrolled immigration problem to a large degree and restrict immigration to fathers with families, women and children, who are more likely to be in legitimate need for asylum and less likely to cause trouble.

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Interestingly, there seems to be a co-relation between an excessive population of young men and civil wars, political instability and general violence and lawlesness. Considering how these places also tend to have a sexually-repressive religion, cultural norms that forbid sex outside marriage, condemn prostitution and other forms of sexual release, have high unemployment and low education levels, require men to pay a large bride-price in order to get married (which many cannot afford for the aforementioned reasons of unemployment and poor literacy), and there's a general shortage of females of marriable age anyway, no wonder there's a plentitude of sexually-frustrated horny young men with raging hormones looking for ways to vent their frustration.

Unsurprisingly, many of them who come to Europe with it's population of spineless emasculated men who are too accustomed to rely on authorities for justice and too pussy-whipped and beaten down to defend their women find Europeans and especially their womenfolk easy prey for their destructive urges, which is further aggravated by the inaction of authorities.