It is my opinion that any student that wishes to carry on their studies should be allowed to go back in, and back out again too.
But there again, I am of similar opinion for the adult population. If they want to continue working, let them go in to work where any half decent or better employer will have provided the resources to do the job, and not merely officially employed someone but in reality expect them to provide their own working conditions as if they were hired as self employed contractors.
As for those who are considered vulnerable, let them take precautions and the authorities should help them to do so.