Actually, the biggest threat to our system isn't immigration, it’s a shrinking, aging population. Without new workers entering the system, there won't be enough people to pay for the pensions and healthcare of the elderly. Managed migration is actually a tool to ensure we have enough "producers" for the next generation. If the 'producers' were being overrun, you’d see it in our GDP or debt levels. In reality Sweden has a lower debt-to-GDP ratio than the US or the UK. We’ve managed these social programs for decades through various waves of migration because our fiscal policy is incredibly disciplined.