'The feckless' - ah, nothing like a dose of contempt for your fellow humans.
Many of the long-term employed have all manner of issues that need addressing if they are to be of use. Drug addiction is quite common. Low self-esteem. Various forms of illness, including psychological ones. The need to provide child care or to care for older and disabled relatives. If you think all this can be sorted out with a wave of a magic wand you are kidding yourself.
The level of unemployment is low by historic standards and the labour market is tight. This is despite quite high levels of government-approved immigration. As in approved by the government. Not by Jeremy Corbyn. Not by the imaginary 'Blob'. Not by me. By the government, responding to market demand. Do you not understand these elementary concepts?
Most of our native unemployed do not have the skills/education to provide the workers we need most. It's as simple as that. Some could possibly be trained up. But it will take money and time.
As I said, if you seriously want to reduce immigration, you need a plan. A plan that acknowledges that there will be issues for the economy, tax rises and later retirement for all. Anything less is specious bollocks. Like Brexit was. (Another thing we did off-the-cuff without any real plan).
If you want to go down that road, fine. I have no objection in principle. What I object to is unplanned policy damaging our economy and causing chaos. Make no mistake, making a massive reduction in immigration is a fundamental change in the way our economy functions. It means massive government intervention and higher costs. It will also have to be phased in, as you cannot train doctors (for example) overnight.