People are WFH because all workplaces, other than ones where it was essential that key work was carried out in site" were closed.
They would have closed even if schools had remained open
Pre-symptomatic people (including DC) can transmit COVID, and the asymptomatic can too (though less commonly than first thought)
It's nitnabout the safety of DC, but of everyone else
The shielded are already supported to remain at home entirely and indefinitely. That's not an age related group, they're those of any age -including children - who have certain medical conditions. That's the equivalent of over the entire population of NI taken out of society already.
Would all the vulnerable need to go indoors as well? So that even if DC took it home, they wouldn't be making anyone unduly ill. You'd add millions of people to the numbers who couid not be compelled to leave their homes for any reason.
That wouid lead to huge dislocation and further inequalities, and probably wouid prolong economic consequences.
Not least if DC who had a vulnerable household member from whom they could not isolate were included in the 'stay at home' category. Not least because pregnancy is considered a vulnerable time.
And what policy do you propose to put around those who are at greater risk because the disease strikes harder, and in younger people, of the BAME community?