Yes, obviously, @CherieBabySpliffUp
However, these are young people. My oldest has been at home from boarding school since March. Teenagers have paid a horrendous price for something that, on the whole, doesn't affect them.
If any of my 18 yr old's friends had vulnerable family at home, they wouldn't have come. However, I have known all these people since my children were toddlers, They are not strangers. One of his friends didn't come because his dad is vulnerable.
They all 'get' this. However, they should not live in purdah now, if they can do otherwise reasonably safely.
My risk assessment is that these young people will be going to university in a few weeks' time. They will then have to make their own risk assessments. Their risk of being run over is arguably greater than their risk of contracting or passing on Covid.
Everyone needs to take a deep breath and exercise a bit of common sense.