JimI already explained that the population of the UK has grown by nearly 25% since 1960. With uncontrolled immigration what will the figure be in the next few years. If the system is overwhelmed no one will benefit. The who, what, why, when, where does not alter this inescapable fact one iota.
What happened to the native peoples of Australia, New Zealand, the US and Canada when overwhelmed by what would be called today, illegal immigrants? What happened to their culture and way of life?
You can wring your hands and bleat as much as you like but history shows that when the indigenous population is overwhelmed genocide results.
That is a fact!