As Dylan Thomas said, (paraphrasing) no race or social tier is ''wholly bad or wholly good'' ... but there are trends and tendencies, which are likely to tar all with the same brush.
What I mean is, there are towns in the UK (and cities) where the vast majority of crime is perpertrated by the ethnic 'minority', and something must therefore be done to discourage that minority from coming her, or encouraging them to work and be honest.
Like all things in life the 'carrot and stick' principle holds true here. If it is a cushy number to have underage sex, keep the resultant offspring to avoid work and also get housed for free then it will be an attractive proposition. If those actions draw ridicule, stigma and massive inconvenience then less of it would go on.
If the punishment for an illegal migrant stealing vodk from Asda was public flogging, followed by immediate deportment then very little of it would go on.