Some jobs are gone forever. They won’t come back. Some jobs are obsolete and/or threaten the planet in various ways such as polluting air, land, and water.
Entrepreneurs start businesses to make a profit. In a global economy, labor costs which play a large part in determining profitability, often make ,some countries’ more competitive for investment dollars.
In a world of rapid change, it is inconceivable that retraining does not have high priority in ANY country. Perhaps it is hard for career politicians to see this, since their jobs don’t change or disappear over time.