As of Jan 21st 4,717 people in England between the ages of 0-59 died with coronavirus. That includes people with severe health conditions who are very vulnerable to all illnesses. Considering there are about 50.6 million people in that age group in England, that number represents 0.0093% of that age group. To put that number in context, in 2018 27,198 people under the age of 64 died of pneumonia and influenza (which are categorised together by the ONS) - conditions that most people don't worry very much about, especially if they are generally healthy.
In Sweden, the number of deaths of people under 70, as of Feb 2021, is 1,113. Again that includes clinically vulnerable people. It represents about 0.013% of that section of the population. That's with schools open for younger people the whole time, shops and restaurants open, hairdressers open, gatherings of up to 50 people allowed etc etc.
All over the world, no matter what the mitigation measures have been, the deaths of under 70s have been low, especially when compared to other respiratory illnesses like pneumonia and flu. The threat to people under 70, even people who are clinically vulnerable, is not high. The threat to people with no illnesses is extremely low, so low that at times the ONS has had to stop reporting it.
So why do people still believe they're in huge danger?