Denmark Says Covid-19 hasn't accelerated since reopening:

https://www.rt.com/newsline/487461-denmark-control-gradual-reopening/?utm_source=rss&utm_medium=rss&utm_campaign=RSS

Daycare and schools are reopened as first step when they are the most vulnerable?  

They are the least vulnerable.  All the clinical data has shown that.  When children do get it, it is rare that it becomes critical.  Overwhelmingly, it is like a cold that is brushed off.

Who is most vulnerable?
the obese
those with hypertension
those with diabetes
those with coronary artery disease
those with diagnosed COPD
those with elevated lipidemia
Age-wise, the elderly are most vulnerable because of usually less vigorous immune systems
Children are not likely to have the above underlying conditions.